Geoff Baker
Posted November 14, 2014 - 7:24am
Welcome to myBulova KGBirk, this is a beautiful watch. I think you're most fortunate to have such a wonderful keepsake from your great grandfather. Diamond Excellency model watches were made for 5 or so years in the mid sixties, I think this is the first version. This one was also available in white gold.
My vote for ID is Diamond Excellency.