Seiko Prospex Divers

Most Seiko Prospex Divers references take a 22 mm watch strap: 56 of 83. The lug width follows the case size: 43 mm case → 20 mm, 44 mm case → 22 mm, 45 mm case → 22 mm and 48 mm case → 24 mm.

Shop 19 mm Shop 20 mm Shop 22 mm Shop 24 mm

Seiko Prospex Divers lug width by case size

83 references measured. Updated 2026-10-29.

Case	Lug width	References	Watch strap attachment	For example
39 mm	19 mm	1	—	SLA017J1
40 mm	19 mm	1	—	SLA017J1
43 mm	20 mm · 22 mm on 6	16	—	SBDC181, SPB051J1, SPB053J1
44 mm	22 mm · 20 mm on 6	19	—	SRPB09, SRPB49, SRPB51
45 mm	22 mm · 20 mm on 5	37	—	SBDX014G, SRP773, SRP773
48 mm	24 mm · 22 mm on 1	4	—	SUN019P1, SUN021P1, SUN065P1
49 mm	24 mm	1	—	SSF001J1
52 mm	22 mm	4	—	SRPA79K1, SRPA81K1, SRPA82K1

References that take a different watch strap

SRPB49: 22 mm, not the 20 mm of most 43 mm cases
SRPB51: 22 mm, not the 20 mm of most 43 mm cases
SRPB53: 22 mm, not the 20 mm of most 43 mm cases
SRPB55: 22 mm, not the 20 mm of most 43 mm cases
SRPB99: 22 mm, not the 20 mm of most 43 mm cases
SRPC43: 22 mm, not the 20 mm of most 43 mm cases
SBDX017: 20 mm, not the 22 mm of most 44 mm cases
SBDX017: 20 mm, not the 22 mm of most 44 mm cases
SNE435P1: 20 mm, not the 22 mm of most 44 mm cases
SNE437P1: 20 mm, not the 22 mm of most 44 mm cases
SNE439P1: 20 mm, not the 22 mm of most 44 mm cases
SNE441P1: 20 mm, not the 22 mm of most 44 mm cases
SBDC039: 20 mm, not the 22 mm of most 45 mm cases
SBDC047: 20 mm, not the 22 mm of most 45 mm cases
SSC485P1: 20 mm, not the 22 mm of most 45 mm cases
SSC487P1: 20 mm, not the 22 mm of most 45 mm cases
SSC489P1: 20 mm, not the 22 mm of most 45 mm cases
SBBN035: 22 mm, not the 24 mm of most 48 mm cases

Questions about the Seiko Prospex Divers

Do all Seiko Prospex Divers case sizes take the same watch strap?

No. The lug width changes with the case size: the 43 mm case takes 20 mm, the 44 mm case takes 22 mm and the 45 mm case takes 22 mm. Check your case diameter before you buy.

Can two Seiko Prospex Divers watches with a 45 mm case take different watch straps?

Yes. Of the 37 Seiko Prospex Divers references with a 45 mm case, 32 take 22 mm and 5 take 20 mm. The reference number decides, not the case size alone.