Valjoux 72 used by Rolex in the early days of the Daytona.
It was an absolute pleasure to work on this now well preserved movement.
Perfomance compares to new timepiece
DUP +3 s/day | 320 dgrs. Amplitude
DDN +1 s/day | 310 dgrs. Amplitude
CDN +7s/day | 267 dgrs. Amplitude
Dial Up, Dial Down, Crown Down