TedDBayer

I'm working on a 38 Chev ,2dr sedan,The data plaque is missing and I can find a new replacement,but I'm unsure and have no info of what to put on one.First line would read'master deluxe', next line would be someting like 21ABCD 55555,as an example.Can anyone tell me what the serial number is based on and maybe I can make something up? Thankyou Ted