Personally owned -- like several others upthread,
an Argus C3 purchased new at the end of 1957 -- the Brick! After about 35 years in the back of the closet, it has been out at least once every year since 2006 to shoot a roll for Argus Day. I subjected it to a DIY CLA and rangefinder calibration in the succeeding couple of years. It is certainly no longer my first choice for most work, but some of what it's done in recent years has come out significantly better than I expected.
Prior to that I did some stuff with a folding Kodak of late 1930s vintage that my parents owned. I have no idea (60 years later) exactly what it was, but it had some control. Alas, my first personally owned camera was a Brownie Target Six-20 -- not much control there!