My Folsom Audley fits a 5" Reg. Mag. and is marked:

A 145
MAG. 5

in two parallel lines. It appears that the numbers are individually stamped.

One thng that hasn't been mentioned are the variations of the "drop". Mine has a slight forward cant, as does the first one pictured in this thread. Others seem to be a straight drop, or a rear (FBI) cant. There is also a swivel drop pictured.

Bob