Fortis Cosmonaut 623.10.51
The Fortis Cosmonaut 623.10.51 takes a 20 mm watch band.
Fortis · Cosmonaut
- Lug width
- 20 mm
- Case diameter
- 40 mm
- Reference
- 623.10.51
- Family
- Cosmonaut
- Case material
- Acciaio
- Model
- Spacematic Counterrotation
Bands that fit
Cut and stitched in Milano, in the width this watch takes.
Single Pass Hammered Yellow Calfskin Strap
Saffiano Leather Strap Light Blue Ecru Stitching
Hammered Black Calfskin Strap — Ecru Stitching
Black Calfskin NATO Strap
Black Saffiano Rubber StrapWill a strap close on your wrist?
Set for this watch: 40 mm of case and 20 mm between the lugs. Add your wrist and see where a standard strap would close.
mm
Filled in with the case diameter, which is what we hold for this reference. Measure the watch tip to tip for the exact answer: it is usually a few mm more.
Enter your wrist measurement to see whether a standard 75/115 mm strap closes on you, and where.
Sizing notes
- 20 mm is the gap between the lugs, so a 20 mm band goes in without adapters. Whether it sits flush against a 40 mm case depends on how that case is shaped.
- 20 mm is one of the common sizes: 15,081 of the 41,485 watches measured take it, which is why it is the width most bands are cut in. Every watch that takes 20 mm →
