Also found the OEM Siffert C11 edition strap. It arrived today at my AD!
Part number is FC8235
This is the combo of the vintage Rindt Autavia, and I really like how the CBE2110 looks with this strap
In this issue of the Chronos magazine, the Autavia Heuer 02 was also presented this way
In this picture, the three existing OEM leather straps for the Autavia Heuer 02:
- Camel (FC8226)
- Black with white stitching from the Viceroy and Harrods editions (FC8246)
- Black from the Siffert C11 edition (FC8235), which is longer that the other two