Hello, Fitzy40.

http://www.1954advance-design.com/chev-specs/1948-Chevrolet-t-ser.jpg

21RW-A 1230
21 = Janesville, CA assembly plant (actually in Wisc, as corrected/noted in a post below - thanks)
RW = 6400
-A = ?
1230 = 1230-1000 = 230th 6400 out of that plant that model year

Attachments
1948 6400 ID tag IMG_1185.jpg (92.42 KB, 116 downloads)
1948 6400 ID tag IMG_1185.jpg (92.42 KB, 113 downloads)

Last edited by tclederman; 03/10/2018 3:41 AM.