A. Lange & Söhne Lange 1

Most A. Lange & Söhne Lange 1 references take a 20 mm watch strap: 87 of 150. The lug width follows the case size: 36 mm case → 19 mm, 37 mm case → 19 mm, 39 mm case → 20 mm and 42 mm case → 22 mm.

Shop 18 mm Shop 19 mm Shop 20 mm Shop 22 mm

A. Lange & Söhne Lange 1 lug width by case size

150 references measured. Updated 2026-10-29.

Case	Lug width	References	Watch strap attachment	For example
36 mm	19 mm	15	—	111.021, 111.025, 111.032
37 mm	19 mm · 20 mm on 4 · 18 mm on 1	15	—	181.037, 181.038, 181.039
39 mm	20 mm	61	—	101.002, 101.005, 101.021
40 mm	20 mm	6	—	320.021, 320.025, 320.028
41 mm	20 mm · 22 mm on 1	15	—	117.021, 117.025, 117.025DUB
42 mm	22 mm · 20 mm on 2	35	—	115.021, 115.022, 115.025
not recorded	22 mm	3	—	116-05, 31-130-039F, 345-033-E

References that take a different watch strap

181.063: 18 mm, not the 19 mm of most 37 mm cases
182.030: 20 mm, not the 19 mm of most 37 mm cases
182.830: 20 mm, not the 19 mm of most 37 mm cases
819.048: 20 mm, not the 19 mm of most 37 mm cases
819.049: 20 mm, not the 19 mm of most 37 mm cases
115.046: 22 mm, not the 20 mm of most 41 mm cases
116.025: 20 mm, not the 22 mm of most 42 mm cases
119.026: 20 mm, not the 22 mm of most 42 mm cases

Questions about the A. Lange & Söhne Lange 1

Do all A. Lange & Söhne Lange 1 case sizes take the same watch strap?

No. The lug width changes with the case size: the 36 mm case takes 19 mm, the 37 mm case takes 19 mm, the 39 mm case takes 20 mm, the 41 mm case takes 20 mm and the 42 mm case takes 22 mm. Check your case diameter before you buy.

Can two A. Lange & Söhne Lange 1 watches with a 37 mm case take different watch straps?

Yes. Of the 15 A. Lange & Söhne Lange 1 references with a 37 mm case, 10 take 19 mm, 4 take 20 mm and 1 take 18 mm. The reference number decides, not the case size alone.