Omega pulsometers (Photo gallery)

I invite you to post photos of your Omega pulsometers, with a movement's summary and details about your watch. I begin with my 2277-1, case steel, inside dial with pulsometer scale (base 30), movement is manual winding, caliber 27 Chro C12 T2 (aka 321) 17 jewels, movement number 10723658 (50s).
Before maintenance:


After maintenance: