Longines Saint Imier

Most Longines Saint Imier references take a 20 mm watch strap: 62 of 95. The lug width follows the case size: 30 mm case → 15 mm, 39 mm case → 20 mm, 41 mm case → 20 mm and 43 mm case → 20 mm.

Shop 18 mm Shop 20 mm

Longines Saint Imier lug width by case size

95 references measured. Updated 2026-10-29.

Case	Lug width	References	Watch strap attachment	For example
30 mm	15 mm	28	—	L2.563.0.87.2, L2.563.0.87.6, L2.563.4.52.3
39 mm	20 mm · 18 mm on 5	28	—	L2.753.4.52.3, L2.753.4.53.3, L2.753.4.53.6
41 mm	20 mm	27	—	L2.752.4.52.3, L2.752.4.52.6, L2.752.4.53.3
43 mm	20 mm	8	—	L2.784.4.52.3, L2.784.4.52.6, L2.784.4.53.3
44 mm	20 mm	4	—	L2.764.4.53.3, L2.764.4.53.6, L2.764.4.73.0

References that take a different watch strap

L2.753.4.52.6: 18 mm, not the 20 mm of most 39 mm cases
L2.753.4.72.0: 18 mm, not the 20 mm of most 39 mm cases
L2.753.4.73.6: 18 mm, not the 20 mm of most 39 mm cases
L2.753.5.52.7: 18 mm, not the 20 mm of most 39 mm cases
L2.753.5.72.0: 18 mm, not the 20 mm of most 39 mm cases

Questions about the Longines Saint Imier

Do all Longines Saint Imier case sizes take the same watch strap?

No. The lug width changes with the case size: the 30 mm case takes 15 mm, the 39 mm case takes 20 mm, the 41 mm case takes 20 mm and the 43 mm case takes 20 mm. Check your case diameter before you buy.

Can two Longines Saint Imier watches with a 39 mm case take different watch straps?

Yes. Of the 28 Longines Saint Imier references with a 39 mm case, 23 take 20 mm and 5 take 18 mm. The reference number decides, not the case size alone.