Omega Speedmaster Broad Arrow

Most Omega Speedmaster Broad Arrow references take a 20 mm watch strap: 33 of 45. The lug width follows the case size: 42 mm case → 20 mm and 44 mm case → 21 mm.

Shop 20 mm Shop 21 mm

Omega Speedmaster Broad Arrow lug width by case size

45 references measured. Updated 2026-10-29.

Case	Lug width	References	Watch strap attachment	For example
42 mm	20 mm · 21 mm on 3	36	—	3151.50.00, 3152.30.00, 3153.80.00
44 mm	21 mm	9	—	321.13.44.50.02.001, 3581.30.00, 3581.50.00

References that take a different watch strap

321.10.44.50.01.001: 21 mm, not the 20 mm of most 42 mm cases
321.10.44.50.02.001: 21 mm, not the 20 mm of most 42 mm cases
321.13.44.50.01.001: 21 mm, not the 20 mm of most 42 mm cases

Questions about the Omega Speedmaster Broad Arrow

Do all Omega Speedmaster Broad Arrow case sizes take the same watch strap?

No. The lug width changes with the case size: the 42 mm case takes 20 mm and the 44 mm case takes 21 mm. Check your case diameter before you buy.

Every Omega Speedmaster Broad Arrow reference

Other Omega families

Inside each one the lug width often changes: it is the reference that decides.

All Omega families → · Why the size changes inside a family →