First I took apart the glove compartment, disassembled the lock and found the ever-present code (on pre-1974 cars) stamped into the lock plug. That key also fit the trunk, yahoo!
Next we (the owner and I) worked on the door lock, hoping it would be the same as the ignition (which does not come out without either, A: a key, or B: a drill). On the shaft coming out the back of the door handle, the code is stamped. Low and behold, the key also fit the ignition. Original locks since 1950. Job done.