Straps & sizing · updated November 2026

Seiko Presage Cocktail Time strap size

Lug widths for every Cocktail Time reference we track, including the SRPB41, SRPB43 and SRPB46.

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The short answer

Most Cocktail Times take 20 mm straps: both the 40.5 mm (SRPB41, SRPB43, SRPB46, SRPD37, SRPK15) and the 38.5 mm (SRPE41, SRPE43, SRPE45) cases. The 34 mm models take 17 mm. The 38.5 mm models ship with quick-release spring bars per Seiko.

By case size

Family	Lug width	Refs	Examples
40.5 mm	20 mm	16	HCB004 · HCB005 · HCB006 · SRPB41 · SRPB43 · SRPB46…
30.3 mm	14 mm	6	SRE007 · SRE009 · SRE010 · SRE017 · SRE018 · SRE020
38.5 mm	20 mm	6	HCB001 · HCB002 · HCB003 · SRPE41 · SRPE43 · SRPE45
34 mm	17 mm	4	SRPL61 · SRPL63 · SRPL64 · SRPM06
33.8 mm	17 mm	2	SRP839 · SRP841

Want a slimmer dress watch? See the thinnest Seiko watches.


SRE007	Presage	14 mm	30.3 mm	37 mm	10.9 mm	–	–
SRE009	Presage	14 mm	30.3 mm	37 mm	10.9 mm	–	–
SRE010	Presage	14 mm	30.3 mm	37 mm	10.9 mm	–	–
SRE017	Presage	14 mm	30.3 mm	37 mm	10.9 mm	Bracelet	–
SRE018	Presage	14 mm	30.3 mm	37 mm	10.9 mm	Bracelet	–
SRE020	Presage	14 mm	30.3 mm	37 mm	10.9 mm	Cow leather	Yes
SRP839	Presage	17 mm	33.8 mm	40.4 mm	11.3 mm	Bracelet	–
SRP841	Presage	17 mm	33.8 mm	40.4 mm	11.3 mm	Bracelet	–
SRPL61	Presage	17 mm	34 mm	40.4 mm	10.7 mm	Bracelet	–
SRPL63	Presage	17 mm	34 mm	40.4 mm	10.7 mm	Bracelet	–
SRPL64	Presage	17 mm	34 mm	40.4 mm	10.7 mm	Bracelet	–
SRPM06	Presage	17 mm	34 mm	40.4 mm	10.9 mm	Bracelet	–
HCB001	Presage	20 mm	38.5 mm	45.4 mm	11.8 mm	Bracelet	–
HCB002	Presage	20 mm	38.5 mm	45.4 mm	11.8 mm	Cow leather	Yes
HCB003	Presage	20 mm	38.5 mm	45.4 mm	11.8 mm	Cow leather	Yes
SRPE41	Presage	20 mm	38.5 mm	45.4 mm	11.8 mm	Cow leather	Yes
SRPE43	Presage	20 mm	38.5 mm	45.4 mm	11.8 mm	Cow leather	Yes
SRPE45	Presage	20 mm	38.5 mm	45.4 mm	11.8 mm	Cow leather	Yes
HCB004	Presage	20 mm	40.5 mm	47.5 mm	12.8 mm	Bracelet	–
HCB005	Presage	20 mm	40.5 mm	47.5 mm	12.8 mm	Cow leather	–
HCB006	Presage	20 mm	40.5 mm	47.5 mm	12.8 mm	Bracelet	–
SRPB41	Presage	20 mm	40.5 mm	n/p	11.8 mm	Bracelet	–
SRPB43	Presage	20 mm	40.5 mm	n/p	11.8 mm	Cow leather	–
SRPB46	Presage	20 mm	40.5 mm	n/p	11.8 mm	Leather	–
SRPD37	Presage	20 mm	40.5 mm	47.5 mm	11.8 mm	Cow leather	–
SRPE15	Presage	20 mm	40.5 mm	47.5 mm	11.8 mm	Bracelet	–
SRPK15	Presage	20 mm	40.5 mm	47.5 mm	11.8 mm	Cow leather	–
SRPK46	Presage	20 mm	40.5 mm	47.5 mm	11.8 mm	–	–
SRPK48	Presage	20 mm	40.5 mm	47.5 mm	11.8 mm	Bracelet	–
SSA459	Presage	20 mm	40.5 mm	47.5 mm	14.4 mm	Cow leather	–
SSK037	Presage	20 mm	40.5 mm	47.5 mm	12.8 mm	Bracelet	–
SSK039	Presage	20 mm	40.5 mm	47.5 mm	12.8 mm	Cow leather	Yes
SSK041	Presage	20 mm	40.5 mm	47.5 mm	12.8 mm	Cow leather	–
SSK049	Presage	20 mm	40.5 mm	47.5 mm	12.8 mm	Cow leather	Yes

Click a column heading to sort. n/p = not published by the brand. Quick-release "Yes" only where the brand page says so; "–" means not stated, not "no".

Which strap type?

Rubber or silicone: the practical choice for swimming and hot weather. It doesn't absorb water and rinses clean.
Fabric single-pass or two-piece nylon: light and cheap. A single-pass strap runs under the case, which adds a little height on the wrist.
Leather: dressier, but water and sweat shorten its life. Keep it off dive watches you actually swim with.
Steel bracelet: the most durable, but aftermarket bracelets need end links shaped for the specific case, which brands rarely publish. Buy one listed for your exact reference.

Spring bars: what Seiko doesn't publish

Seiko lists lug width, but not spring-bar diameter or a strap code. Aftermarket straps vary in how large their spring-bar holes are, so before you buy, check the strap's stated hole size against the bars you'll use, or reuse the original bars if they fit. See our spring bars and tools guide.

Shop straps

20 mm leather straps on Amazon 17 mm leather straps on Amazon

Paid links to Amazon search results. Check the listed width and spring-bar hole size against the table above.

Questions

What lug width is the Seiko Cocktail Time?

20 mm for the 40.5 mm and 38.5 mm cases; 17 mm for the 34 mm cases, per Seiko.

What is the SRPB43 lug-to-lug?

Seiko doesn't publish it on the SRPB43 page. The later 40.5 mm Cocktail Times (SRPD37, SRPK15) list 47.5 mm.

What strap suits a Cocktail Time?

Leather is the natural match for a dress watch; it is rated to 50 m per Seiko, so keep leather away from water.

Not sure? Try Watch Finder →

Watch.co is independent and not affiliated with any brand. We haven't handled these watches for this page: everything here comes from brand-published specs and our own analysis. Brand names are used only to identify products.