Jim,
I think yours is "IA Co SAC CA" which is InterAmerican Company, Sacramento, California.

Miller's gun is Century Arms,which was in St Albans VT as Jim correctly posted.

Here is a thread on the ones that Val brought in;
http://thefiringline.com/forums/showthread.php?p=1570377

Neat guns, and I should have bought one then but I was lucky if I brought home any of my paycheck back then while working in the true "kid in a candy store" job.

Hillary For Prison 2018