Looking for pics of original 1970 3/4T Brake Boosters

[IronCanine]

Hi guys. I'm trying to recreate the broadcast code stamp that was on '70 3/4T brake boosters. The code was CG. It was stamped in white, usually on top of the booster. The stamp was low on ink when they stamped mine (see pic). So they just pushed harder and I got more of a relief than a true stamp. Trying to get the "G" right, and I don't have enough to go on. I have found many pics of trucks on line that clearly have the original booster with the stamp...but no pics close up of a good stamp. Hopefully somebody stumbles on this thread, has an original one and can post a pic. Thanks to all for looking and for any help.

Brad