The following pic shows an original Murray Corporation body tag from a 1932 Model B Deluxe (3 window) Coupe.
The prefix B520 is the Ford body style code for the 3 window Deluxe Coupe. The body number 6686 is a relatively early production out of about 21,000 total.
This tag was originally riveted to the floor cross sill under the front passenger (RH) seat.
Thanks to HAMB'er '3wLarry' for allowing the use of his pics on Ford Garage!