Certina

Certina (Kurth Frères SA) is a underestimated brand that made great quality in-house movements right up to the quartz crisis of the 1970’s. A cool thing about Certina is that you can date your watch by looking up the serial number. There is also write up on the kurth frères/Certina history here. 

1951 Certina Case ref: 8721.1. Calibre KF320. Serviced by me. Case size 33mm w/o crown. Asking price £280 Click on image for more photos.