Replacement keys for '39 Plymouth

[likaleica]

Posted this on PH classic cars forum but the best anyone came up with was "get a locksmith in" which may be a solution but a very expensive one.......Please does anyone know where I can get replacements for lost keys for my 1939 Plymouth Sedan ? The dealer I bought the car from lost all the keys(yes...) while storing it for me for a couple of months. I've found the number 652 stamped on the ignition lock outer casing near the lock barrel(not on the lock barrel itself) which is labelled Bosch (surely not original for an American car ??)Is that number significant? The door and trunk locks don't seem to have any numbers. I want to avoid changing all the locks so I'd really welcome any information on what series keys these Chrysler cars had so that I'm not starting with a blank page (and cheque!)

Thanks guys.