I have recently acquired 3 Sydney Lucas Zoltan Silhouettes, I think maybe they are from 1940's or 1950's... if anyone could give me some info on SLZ or on the silhouettes, if they are collectible, or worth anything. Thank you

There's many posts here concerning SZL and the Paris Etching Society.
Try here for starters.
I'm sorry to say that they aren't worth a great deal, a few hundreds at most.