A. Lange & Söhne 1815

Most A. Lange & Söhne 1815 references take a 20 mm watch strap: 47 of 69. The lug width follows the case size: 36 mm case → 19 mm, 39 mm case → 20 mm, 40 mm case → 20 mm and 41 mm case → 20 mm.

Shop 16 mm Shop 18 mm Shop 19 mm Shop 20 mm Shop 22 mm Shop 24 mm

A. Lange & Söhne 1815 lug width by case size

69 references measured. Updated 2026-10-29.

Case	Lug width	References	Watch strap attachment	For example
34 mm	16 mm · 17 mm on 1	2	—	220.037
36 mm	19 mm	10	—	206.021, 206.025, 206.029
37 mm	19 mm	4	—	212.050, 303.021, 303.025
38 mm	20 mm · 19 mm on 1	3	—	239.050, 245.021
39 mm	20 mm	8	—	234.021, 234.026, 234.032
40 mm	20 mm · 19 mm on 1	26	—	233.021, 233.025, 233.032
41 mm	20 mm	6	—	297.021, 297.026, 297.032
42 mm	20 mm	4	—	421.025, 421.032, 421.048
43 mm	18 mm · 20 mm on 1 · 22 mm on 1	3	—	706.025
50 mm	24 mm	1	—	912.032
not recorded	20 mm · 22 mm on 1	2	—	1815-239-05

References that take a different watch strap

220.028: 17 mm, not the 16 mm of most 34 mm cases
223.032: 19 mm, not the 20 mm of most 38 mm cases
233.026: 19 mm, not the 20 mm of most 40 mm cases
404.047: 22 mm, not the 18 mm of most 43 mm cases
706.050: 20 mm, not the 18 mm of most 43 mm cases
706-025FE: 22 mm

Questions about the A. Lange & Söhne 1815

Do all A. Lange & Söhne 1815 case sizes take the same watch strap?

No. The lug width changes with the case size: the 36 mm case takes 19 mm, the 39 mm case takes 20 mm, the 40 mm case takes 20 mm and the 41 mm case takes 20 mm. Check your case diameter before you buy.