Fred:
I have a CA Bubble and the deco plate is pale blue. None in the front
and not holes where one may have been so I assume AS just put them on
the rear. and the serial # is 3 numerals as you described and while
grinding all the rust off the frame, I found another location (secret)
with the serial # stamped on the frame - I repainted the frame with
Rustoleum "Rust Preventer" or something like that and the serial #
disappeared - but I know where it is.
Jo Ann