US 20x110 HS (electic M24) TP M99"RIAMC" or "R 1 AMC"


#1

Anybody to tell what “RIAMC” or “R 1 AMC” means?

Image from the web:


#2

Alex, it is the ammunition identification code (R1AMC).


#3

Fede, thanks!
I am more used to modern ones so did not recognize this one.

BTW: do you happen to know when ID codes were introduced?


#4

Group Code “R” was introduced with the Standard Nomenclature List (SNL) as early as 1927 and the complementary AIC was added in 1942.


#5

Fede, thanks! That is earlier than I thought!