What is the model ?

Hello,
Sorry for my english :) I try write in understandable method.
i got a watch from my grandfather, IWC, but i don't know anything about it.
Maybe one of you can tell me some about it ?

Best Regards
TOm

Hi Balu000

You have an IWC Cal 83 or 88
Which was made in the following years
CAL 83: 1930 - 1947
CAL 88: 1946 - 1964

Without seeing the movement or having a movement number to date it, I am not certain which one it is.