Old Diebold Safe Age??

I just picked up an old Diebold safe. It had been sitting in a garage for over fifty years. Its a single door 53 tall by 28 wide by 29 deep. It works fine and I have the combination its a 5 number combination. I can't find a serial number but the numbers on the handle are 2039 and 190260. also stamped in the concrete inside the door panel is 12251 18 and 2039.I attempted to remove the lock and dial but the dial does not separate from the lock I would like to remove the dial and trim for a cleaner re paint rather than just mask it off. I would also like to find out the date of manufacture. Thanks Steve