Here's an 8 3/8" pair, K-38 and K-22, both with target hammers and triggers. I made these grips to fit my hand, wrinkle paint not the prettiest. But I have EOM grips. Not 5 screw but keepers. Probably '60's vintage. I think 5 screw guns are from the '50's..

DF

[Linked Image from i.imgur.com]