Electro-mechanical Elgin 

This is a early electro-mechanical Swiss watch.  All original.
watch measures `35 by 38 millimeters .

Stainless steel back.  
You unscrew the battery hatch to replace the battery.
Has the original band but the band has some wear spots on it,
not bad, can be changed if needed.

The movement is an Swiss E.S.A. one of the best they ever made.
Works great and keeps time.