I'm an avid vintage collector of the Swiss brand Alpina. Especially chronographs and pre-war time only pieces. Therefor I'm building a register to identify all the variations and dates of manufacturing which I'd like to share publicly if I have enough material to show conclusions. So I need your help! Do you own an Alpina chronograph from the 50's or older and would you like to add it to the register? Or do you own an Alpina watch with an engraved date please let me know so I can add dates to specific serial numbers. Thank you in advance! Below two pieces from my collection. A black Triangle logo dial Alpina with Angelus 215 and a very rare cased Alpina with 943 movement.