My latest is a nice Gruen Quadron from the late 1920's. This makes 2 of these watches that I own. My watch maker had this watch on his watchmakers table and was in the process of timing it when he showed it to me. When he mentioned the price, I handed the debit card over light speed. He would not let me have it until he was finished timing it and had replaced the crown with a correct looking one. He got the crown last Saturday but will not let me pick it up until this Saturday to make sure it is running correctly.
The pic shows the watch before it got its new crown
I like the Qaudron watches because they helped to usher in the age of square/rectangular movements in square/rectangular cases.