Wow, I’ve never seen that bezel in a Speedmaster. What model Speedy is that?
Thanks for your kind comment 😀
It is a 105.003-65 (Ed White), delivered to the RCAF in July 1966
Imo this reference was the first Omega offers four bezel options (Tachymeter, Telemeter (mile or km), decimal and pulsometer.
Best regards !