There was a change in door handles for 1952, to push button style door handles. Yet, I've been doing a lot of online shopping for the 1952 and 1953 3100's and see a lot of trucks pictured with the earlier door handles. Did some of the '52 3100 and 3600 pickups come equipped with the '51 and earlier style door handles? Or, is someone trying to pass a '51 pickup as a newer model?
Ed I believe that most if not all 52 Chevrolet trucks came with push button door handles. The doors from the earlier models are interchangeable or I believe the door handles could be interchangeable. When they get that age anything could have happened to the doors. This is just a guess. Jim