A. Lange & Söhne Zeitwerk

Most A. Lange & Söhne Zeitwerk references take a 20 mm watch strap: 12 of 18. The lug width follows the case size: 42 mm case → 20 mm and 44 mm case → 21 mm.

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A. Lange & Söhne Zeitwerk lug width by case size

18 references measured. Updated 2026-10-29.

Case	Lug width	References	Watch strap attachment	For example
42 mm	20 mm	10	—	140.021, 140.025, 140.029
44 mm	21 mm · 20 mm on 2	8	—	143.050, 145.025, 145.029

References that take a different watch strap

147.025: 20 mm, not the 21 mm of most 44 mm cases
147.028: 20 mm, not the 21 mm of most 44 mm cases

Questions about the A. Lange & Söhne Zeitwerk

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

No. The lug width changes with the case size: the 42 mm case takes 20 mm and the 44 mm case takes 21 mm. Check your case diameter before you buy.

Every A. Lange & Söhne Zeitwerk reference

Other A. Lange & Söhne families

Inside each one the lug width often changes: it is the reference that decides.

All A. Lange & Söhne families → · Why the size changes inside a family →