My mom's watch, signed Birks on the dial. No idea when she purchased it...looks to be late 40's to late 50's styling. Can anyone ID the movement?
The only visible markings are the ones you see: 17 jewels Swiss. There could be a number or letters under the balance up under a plate, but no matter how I try with a loupe and lights, I can't make it out. Measures approx 12.5mm wide x 20mm long.