I've inherited an old vintage watch from my grandfather, containing the name 'Betra' on the dial. It appears to be a watch made in the 50's or 60's (?) and furthermore bears the words automatic, 22 rubis, incabloc and swiss on the dial. It has a small diameter (+/- 35 mm incl. crown and 16mm strap width), but that's about all I know...
I couldn't find anything about the model, time-piece or even the brand on the internet; is there anybody who knows some more about it or knows somebody that might?
Thanks in advance!