Longines Conquest Heritage

Most Longines Conquest Heritage references take a 20 mm watch strap: 29 of 44. The lug width follows the case size: 35 mm case → 20 mm, 38 mm case → 19 mm, 39 mm case → 20 mm and 40 mm case → 20 mm.

Shop 19 mm Shop 20 mm Shop 22 mm

Longines Conquest Heritage lug width by case size

44 references measured. Updated 2026-10-29.

Case	Lug width	References	Watch strap attachment	For example
35 mm	20 mm	10	—	L1.611.4.52.2, L1.611.4.70.4, L1.611.4.75.2
38 mm	19 mm	13	—	L1.648.4.52.2, L1.648.4.62.2, L1.648.4.78.2
39 mm	20 mm	5	—	L1.641.4.52.2, L1.641.4.52.4, L1.641.4.75.4
40 mm	20 mm · 19 mm on 1 · 22 mm on 1	16	—	L1.645.4.52.4, L1.645.4.75.4, L1.645.6.75.4

References that take a different watch strap

L1.645.8.75.4: 22 mm, not the 20 mm of most 40 mm cases
L1.649.4.62.2: 19 mm, not the 20 mm of most 40 mm cases

Questions about the Longines Conquest Heritage

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

No. The lug width changes with the case size: the 35 mm case takes 20 mm, the 38 mm case takes 19 mm, the 39 mm case takes 20 mm and the 40 mm case takes 20 mm. Check your case diameter before you buy.