Longines Conquest Classic

Most Longines Conquest Classic references take a 15 mm watch strap: 24 of 75. The lug width follows the case size: 30 mm case → 15 mm, 34 mm case → 17 mm, 41 mm case → 20 mm and 42 mm case → 21 mm.

Shop 18 mm Shop 20 mm Shop 21 mm

Longines Conquest Classic lug width by case size

75 references measured. Updated 2026-10-29.

Case	Lug width	References	Watch strap attachment	For example
30 mm	15 mm	24	—	L2.285.0.57.6, L2.285.0.87.6, L2.285.4.56.6
34 mm	17 mm	10	—	L2.386.0.72.6, L2.386.0.87.6, L2.386.3.72.7
36 mm	18 mm	2	—	L2.387.0.57.6, L2.387.0.87.6
40 mm	20 mm · 18 mm on 1	6	—	L2.785.4.56.6, L2.785.4.76.6, L2.785.5.56.7
41 mm	20 mm	7	—	L2.786.4.56.6, L2.786.4.76.6, L2.786.4.79.3-PM
42 mm	21 mm	22	—	L2.798.4.52.3, L2.798.4.52.6, L2.798.4.62.3
not recorded	20 mm	4	—	L2.285.4.56.3, L2.285.4.58.3, L2.285.4.76.3

References that take a different watch strap

L2.785.5.76.7: 18 mm, not the 20 mm of most 40 mm cases

Questions about the Longines Conquest Classic

Do all Longines Conquest Classic case sizes take the same watch strap?

No. The lug width changes with the case size: the 30 mm case takes 15 mm, the 34 mm case takes 17 mm, the 40 mm case takes 20 mm, the 41 mm case takes 20 mm and the 42 mm case takes 21 mm. Check your case diameter before you buy.