I can get a SA-200 with code number 8023. The face plate was replaced and does not have a serial number. I got the code from the barrel.
It's a first generation green light. The second generation green light has the warning face plate.
My '84 is a warning lable, it's code is 8791. My '80 is a first gen green light, with a code number of 8244.

So is there any way to find out what is the exact year of that SA-200 with code number 8023.
Thank you,
Good Luck,

PS. The only SA-200 I don't have is the post Red Face, Black Face that goes untill the first gen green light. So say '71 untill maybe '79.