Omega 550-1305, Escape wheel.

Fits cal: 550, 551, 552, 560, 561, 562, 563, 564, 565, 600, 601, 602, 610, 611, 613, 750, 751, 752.

Original Omega part in very good used condition. No damages, checked by profetional watchmaker. It's ready to us.