Sugess band size chart: 116 printed lug widths, 18 to 22mm, Seestern included

Sugess is the Tianjin Seagull-ecosystem brand whose own storefront answers the strap question in print: 116 of the 152 watch SKUs in the sugesswatch.com feed carry a Lug Width line and 91 carry a Lug to Lug line, every one quoted verbatim below from a fresh pull of the feed at build ^[1]. The same store sells the sister label Seestern, so this is one chart for both brands, and it is the consolidated table neither brand ever published. The odd widths are the reason it needed building: 19 references print 21mm, seven print 19mm, and the Seagull 1963 reissue splits 18mm at 38mm against 20mm at 40mm with one 40mm outlier that still prints 18mm ^[3][4][5]. Generic guides round all of that away.

The printed rails: 31 families, 116 watches, both brands

Every rail above is a contiguous quote from the Key Features list of a product page in the fresh feed pull, read straight off the store's own product JSON ^[1]. Where a family spans case sizes or widths, both printed values appear. The label shape alternates between Lug Width : 20mm and Lug Width: 18mm depending on the page, and the quotes preserve each page's own spacing; nothing is normalized, converted or inferred. The one family with two printed widths at one case size is called out in the 1963 section below.

The Seagull 1963 question: 18mm, 20mm, and the 40mm outlier

The 1963 reissue is the watch people actually buy a Sugess for, and the store prints two different answers for it. The 38mm class, the SU1962 and SU1963 refs on ST19 hand-wound chronograph movements, prints Diameter : 38mm Thickness : 13mm Lug Width : 18mm across all seven refs ^[3]. The 40mm Chrono Heritage generation prints Lug Width : 20mm on Diameter : 40mm ^[5]. And then there is the outlier: the 40mm SU1963S silver dial with swan neck regulator prints Lug Width : 18mm on a Diameter : 40mm case ^[4], the only place in the catalog where the same case size carries two widths. Third-party guides that give the 1963 one width are wrong for half the lineup; measure or match the exact code. Note the official Seagull 1963 from seagullwatch.com is a different, smaller watch (38mm and 40mm on 18mm lugs); the widths on this page are the Sugess-store prints only.

21mm and 19mm: the odd widths nobody stocks

Two odd widths run through this catalog. 21mm sits under 19 references, all 41mm cases: the MoonPhase Master S437-2 (6 refs), the Chrono Heritage S457 and S475 power reserves (9 refs), and the Tourbillon Master SU8000, SU8002 and SU8007 (4 refs), the tourbillons printing Lug Width : 21mm with no Lug to Lug line at all ^[8][14][23]. 19mm sits under the whole Seestern S446 GMT family, seven refs on 39.5mm cases printing Lug Width : 19mm Lug to Lug : 47mm ^[26]. A 20mm strap in a 21mm gap rocks; a 20mm strap in a 19mm gap does not fit at all. Both widths are cheap on paper and annoying in practice, which is exactly why the printed number matters.

Seestern: the sister label in the same store

Seestern is not a separate company to size for: it is the second label of the same Tianjin Seagull ecosystem, sold on sugesswatch.com with its own S-codes. Its 27 width-bearing refs split 20mm on the S434-2, S436-2, S443, S445, S456, S474 GMT and DOX12 families and 19mm on the S446 GMT ^[27][32][33]. The S474 GMT is the big one: Diameter : 42mm Lug Width : 20mm Lug to Lug : 47mm, a strap-friendly combination for a 42mm case ^[32]. Straps sized by the Sugess column fit Seestern watches at matching widths; there is no hidden mount difference between the labels.

The 36 SKUs that print no width

Not every page answers the question. The families below print Diameter and Thickness but no Lug Width line anywhere in their spec blocks, and this chart refuses to guess for them. Twelve further listings in the window are Special Order service SKUs ($10 to $190 placeholders), not watches, and are excluded from the family chart entirely.

For any of these, the fallback is the one that always works: measure the lug gap. The S401 MoonPhase (5 refs) and S394 (5 refs) are the largest families in the not-printed pool, and their owners should not trust any table that prints a width for them, including inherited ones.

How this catalog was counted

The basis is a single fresh en-US pull of the sugesswatch.com product feed at build time, products.json with a 250-product window, returning exactly 250 products ^[1]. Straps and accessories were excluded by title, leaving 152 watch SKUs: 116 print a Lug Width line, 36 do not. The feed itself is live-growing well past 250 products, so the 250-window is the quoted basis of this page; re-pull before relying on a listing added after 2026-09-30. watchbands.ai, the largest strap-size database, listed 205 brands at build time with no Sugess or Seestern entry in slug or text, controls firing ^[2], and search results for Sugess band sizes return only the store's own strap pages and generic width guides, nothing model-specific. No consolidated English width chart for these brands existed anywhere; this page is it. Prices are deliberately absent: the feed serves bare numbers with no currency code, and no price is printed here without a rendered-page verification.

Sources

1. sugesswatch.com product feed, fresh en-US pull at build 2026-09-30 (products.json?limit=250, the 250-SKU single-request window; 250 products returned, 152 watch SKUs after excluding straps and accessories, 116 printing a Lug Width line, 91 printing Lug to Lug; every rail on this page is a contiguous quote from this pull): sugesswatch.com
2. watchbands.ai brand index, fresh pull at build (205 root-relative brand hrefs, zero legacy /brands/ hrefs; no sugess or seestern match in slug or page text; controls seiko, citizen, rolex all present): neither Sugess nor Seestern exists in the largest strap-size database: watchbands.ai
3. sugesswatch.com PDP fresh pull at build: Chrono Heritage SU1962BKM, the Seagull 1963 reissue 38mm class representative printing Diameter : 38mm Thickness : 13mm: sugesswatch.com
4. sugesswatch.com PDP fresh pull at build: Seagull Movement Watch SU1963S 1963 40mm Silver Dial Swan Neck Regulator, the Seagull 1963 40mm SU1963S silver representative printing Diameter : 40mm Thickness : 13mm: sugesswatch.com
5. sugesswatch.com PDP fresh pull at build: Seagull Movement Chrono Heritage SU1963RD40S 40mm 1963 (non Swan Neck version), the Seagull 1963 40mm Chrono Heritage representative printing Diameter : 40mm Thickness : 12mm: sugesswatch.com
6. sugesswatch.com PDP fresh pull at build: S388 Seagull Movement Watch 1780 40mm Automatic Guilloche Dial, the S388 1780 dress representative printing Diameter : 40mm Thickness : 11mm: sugesswatch.com
7. sugesswatch.com PDP fresh pull at build: Chrono Heritage S419-2 Chronograph Zorro Dial, the Chrono Heritage S419-2 Zorro representative printing Diameter : 37mm Thickness : 14.5mm Lug Width : 20mm Lug to Lug : 47mm: sugesswatch.com
8. sugesswatch.com PDP fresh pull at build: MoonPhase Master S437-2 Moon Phase Automatic Stainless Steel Case Blue Dial, the MoonPhase Master S437-2 representative printing Diameter : 41mm Thickness : 13mm Lug Width : 21mm Lug to Lug : 49mm: sugesswatch.com
9. sugesswatch.com PDP fresh pull at build: Chrono Heritage S442 Chronograph Special Dial Swan Neck Regulator, the Chrono Heritage S442 representative printing Diameter : 38mm Thickness : 11mm, 13.5mm with glass Lug Width : 20mm Lug to Lug : 46mm: sugesswatch.com
10. sugesswatch.com PDP fresh pull at build: Heritage S449 DD Date and Day Display DD36 36mm Rose Gold White Pearl Dial Automatic, the Heritage S449 day-date representative printing Diameter : 36mm Thickness : 10mm / 11.5mm with glass Lug Width : 20mm Lug to Lug : 44mm: sugesswatch.com
11. sugesswatch.com PDP fresh pull at build: Automatic S451-2 Blue Sandstone Dial Jumping Hour One Pointer Stainless Steel, the Automatic S451 jumping hour representative printing Diameter : 38mm Thickness : 10mm: sugesswatch.com
12. sugesswatch.com PDP fresh pull at build: Tourbillon Master S454 Rose Gold Green Dial, the Tourbillon Master S454 representative printing Diameter : 38mm Thickness : 8.9mm / 11.5mm with glass Lug Width : 20mm Lug to Lug : 44.9mm: sugesswatch.com
13. sugesswatch.com PDP fresh pull at build: Heritage S455 Ivory Dial Rose Gold Automatic, the Heritage S455 representative printing Diameter : 38mm Thickness : 8.9mm (11.5mm with glass) Lug Width : 20mm Lug to Lug : 44.9mm: sugesswatch.com
14. sugesswatch.com PDP fresh pull at build: Chrono Heritage S457 Chronograph Power Reserve Light Blue Panda Dial, the Chrono Heritage S457 power reserve representative printing Diameter : 41mm Thickness : 14.1mm Lug Width : 21mm Lug to Lug : 49mm: sugesswatch.com
15. sugesswatch.com PDP fresh pull at build: Sugess S458 Deep Grey Dial Stainless-Steel Automatic, the S458 representative printing Diameter : 40mm Thickness : 10mm (12.6mm with glass) Lug Width : 20mm Lug to Lug : 48mm: sugesswatch.com
16. sugesswatch.com PDP fresh pull at build: Heritage S463 BB GMT Blue Dial, the Heritage S463 BB GMT representative printing Diameter : 39.5mm Lug Width : 20mm Thickness : 11mm Lug to Lug : 48mm: sugesswatch.com
17. sugesswatch.com PDP fresh pull at build: Sugess S465 Chronograph Stainless Steel Special Champagne Dial Silver Hand, the S465 chronograph representative printing Diameter : 38mm Thickness : 13mm Lug Width : 20mm Lug to Lug : 46mm: sugesswatch.com
18. sugesswatch.com PDP fresh pull at build: Chrono Heritage S475 Chronograph Power Reserve Smile Pink Panda Dial, the Chrono Heritage S475 smiley power reserve representative printing Diameter : 41mm Thickness : 14.1mm Lug Width : 21mm Lug to Lug : 49mm: sugesswatch.com
19. sugesswatch.com PDP fresh pull at build: Sugess S476 White Glacier Crackle Dial Automatic, the S476 Glacier crackle representative printing Diameter : 40mm Thickness : 12mm Lug Width : 20mm Lug to Lug : 48.2mm: sugesswatch.com
20. sugesswatch.com PDP fresh pull at build: Pilot Master S408 Blue Dial ST2130 Automatic Movement CUSN8 BRONZE, the Pilot Master S408 representative printing Diameter : 42mm Thickness : 13mm Lug Width : 22mm Lug to Lug: 50mm: sugesswatch.com
21. sugesswatch.com PDP fresh pull at build: Pilot Master S409 Green Dial Chronograph CuSn8 Bronze CUSN8 BRONZE, the Pilot Master S409 representative printing Diameter : 42mm Thickness : 13mm Lug Width : 22mm Lug to Lug: 50mm: sugesswatch.com
22. sugesswatch.com PDP fresh pull at build: Chrono Master S438 Deep Blue Dial Power Reserve Indicator, the Chrono Master S438 representative printing Diameter : 41mm Thickness : 12mm: sugesswatch.com
23. sugesswatch.com PDP fresh pull at build: Tourbillon Master SU8000GB Movement Rose Gold Case (customise)(Manual winding), the Tourbillon Master SU8000 representative printing Diameter : 41mm Thickness : 12mm: sugesswatch.com
24. sugesswatch.com PDP fresh pull at build: Tourbillon Master SU8002ISM Manual Movement, the Tourbillon Master SU8002 representative printing Diameter : 41mm Thickness : 12mm: sugesswatch.com
25. sugesswatch.com PDP fresh pull at build: Sugess Tourbillon Master SU8007SW, the Tourbillon Master SU8007 representative printing Diameter : 41mm Thickness : 11mm: sugesswatch.com
26. sugesswatch.com PDP fresh pull at build: Seestern S446 GMT Watch Black Dial (Seiko NH34 GMT movement), the Seestern S446 GMT representative printing Diameter : 39.5mm Thickness : 10mm (13.5mm with glass) Lug Width : 19mm Lug to Lug : 47mm: sugesswatch.com
27. sugesswatch.com PDP fresh pull at build: Seestern S434-2 Stainless-Steel Green Dial Professional Diver Automatic 200m Water Resistant, the Seestern S434-2 representative printing Diameter : 39mm Thickness : 10mm (13mm with glass) Lug to Lug : 46mm: sugesswatch.com
28. sugesswatch.com PDP fresh pull at build: Seestern Heritage S436-2 BB Green Dial GMT Automatic, the Seestern Heritage S436-2 BB representative printing Diameter : 39.5mm Lug Width : 20mm Lug to Lug : 48mm: sugesswatch.com
29. sugesswatch.com PDP fresh pull at build: Seestern Chrono S443 Chronograph Yellow ST19 Movement Lumed, the Seestern Chrono S443 representative printing Diameter : 41mm Thickness : 12mm Lug Width : 20mm Lug to Lug : 46.5mm: sugesswatch.com
30. sugesswatch.com PDP fresh pull at build: Seestern Chrono S445 Chronograph Blue Dial ST19 Movement, the Seestern Chrono S445 representative printing Diameter : 40mm Thickness : 13mm Lug Width : 20mm Lug to Lug : 48.6mm: sugesswatch.com
31. sugesswatch.com PDP fresh pull at build: Seestern S456 GMT Automatic Light Blue Pearl Dial Automatic, the Seestern S456 GMT representative printing Diameter : 41mm Thickness : 13mm Lug to Lug : 48.8mm: sugesswatch.com
32. sugesswatch.com PDP fresh pull at build: Seestern S474 GMT Light Blue Dial, the Seestern S474 GMT representative printing Diameter : 42mm Thickness : 11mm (13mm with glass) Lug Width : 20mm Lug to Lug : 47mm: sugesswatch.com
33. sugesswatch.com PDP fresh pull at build: Seestern DOX12 Checker Dial Diver Luminous, the Seestern DOX12 checker diver representative printing Diameter : 42mm Thickness : 13mm Lug to Lug: 46mm: sugesswatch.com
34. sugesswatch.com PDP fresh pull at build: Seestern Automatic S382 38mm Purple Dial Classic Automatic Watch, the Seestern Automatic S382 representative whose page prints no Lug Width line at all, spec block ends Diameter : 38mm Thickness : 9.5mm: sugesswatch.com
35. sugesswatch.com PDP fresh pull at build: Seestern 430 Titanium Professional Diver (Seagull ST2130 movement), the Seestern 430 Titanium Professional Diver representative whose page prints no Lug Width line at all, spec block ends Diameter : 39mm Thickness : 12.5mm: sugesswatch.com
36. sugesswatch.com PDP fresh pull at build: MoonPhase Master S401C Automatic Blue Gold Stone Star Dust Dial, the MoonPhase Master S401 representative whose page prints no Lug Width line at all, spec block ends Diameter : 41mm Thickness : 13mm: sugesswatch.com
37. sugesswatch.com PDP fresh pull at build: MoonPhase Master S394 (SUM199BT/X) Stainless-Steel Case Creamy Dial, the MoonPhase Master S394 representative whose page prints no Lug Width line at all, spec block ends Diameter : 40mm Thickness : 13mm: sugesswatch.com
38. sugesswatch.com PDP fresh pull at build: MoonPhase Master S395-2 Moon Phase Automatic Enamel Dial Rose Gold, the MoonPhase Master S395-2 representative whose page prints no Lug Width line at all, spec block ends Diameter : 40mm Thickness : 11.5mm: sugesswatch.com
39. sugesswatch.com PDP fresh pull at build: Heritage S466 PP Octagonal Day Display Light Blue Mother of Pearl Dial Stainless-Steel Automatic, the Heritage S466 octagonal day representative whose page prints no Lug Width line at all, spec block ends Diameter : 38.5mm Thickness : 9mm: sugesswatch.com
40. sugesswatch.com PDP fresh pull at build: MoonPhase Master Automatic SU2528GW Enamel Dial, the MoonPhase Master SU2528 enamel representative whose page prints no Lug Width line at all, spec block ends Diameter : 41mm Thickness : 13.5mm: sugesswatch.com
41. sugesswatch.com PDP fresh pull at build: Chrono Heritage SU1901F002GN/SN, the Chrono Heritage SU1901 representative whose page prints no Lug Width line at all, spec block ends Diameter : 40mm Thickness : 12mm: sugesswatch.com