Hi,
your watch looks like a Cal. 89 hand wound classic form the fifties to early sixties. Is it really automatic, that means self winding? If yes then i would expect Automatik to be written on the dial.
Be proud to have a watch like this especially with a history in your family.
Bring it to a good watchmaker, to have a look at the condition of the movement, and to give a slight polish to the case and perhaps add a new crystal. Then take good care of it and give it to the next generation later. The watch will make it for another 50 years easily if you give it a service every now and then.