Breitling Montbrillant

Most Breitling Montbrillant references take a 20 mm watch strap: 54 of 88. The lug width follows the case size: 38 mm case → 20 mm, 40 mm case → 20 mm, 43 mm case → 22 mm and 47 mm case → 20 mm.

Shop 18 mm Shop 20 mm Shop 22 mm

Breitling Montbrillant lug width by case size

88 references measured. Updated 2026-11-03.

Case	Lug width	References	Watch strap attachment	For example
38 mm	20 mm	9	—	A4137012.B875, A4137012.G634, A4137012.Q546
40 mm	20 mm	36	—	AB013012.G709.223A, AB013012.G709.425X, AB013012.G709.428X
42 mm	20 mm	3	—	A1935012.B774, A1935012.C667, A1935012.G592
43 mm	22 mm	33	—	A2130012Q509, A2133012.B571.435X, A2133012.B571.737P
47 mm	20 mm · 18 mm on 1	7	—	A2334021.B871, A2334021.G631, A2334021.Q548

References that take a different watch strap

C2334021G637: 18 mm, not the 20 mm of most 47 mm cases

Questions about the Breitling Montbrillant

Do all Breitling Montbrillant case sizes take the same watch strap?

No. The lug width changes with the case size: the 38 mm case takes 20 mm, the 40 mm case takes 20 mm, the 43 mm case takes 22 mm and the 47 mm case takes 20 mm. Check your case diameter before you buy.