amanico[JLC Moderator]
402842
Vintage Jaeger Chronographs: E 13001 aka " 4 ATM " / E 2638.
Different styles, sizes and eras.
First half of the 60's for the E 2638 on the right, End of the 60's early 70's for the E 13001 " 4 ATM ".
36 mm for the E 2638, 40 mm for the E 13001.
Valjoux 72 for both of them. As well as screw-in case back.
And a big love for both of them, too!
Best,
Nicolas