Another Scorpion pistol turned up I bought it for parts, to complete a pistol in my collection with a modified frame...
But when the pistol arrives, I find that the tumbrest is stippled, something I have never seen on my other Scorpions.
It seems like the stippling is original with the casting of the plastic frame, and not a modification.

The gun is a .177" with a PA serial nu,ber prefix, and has scope grooves plus the later "kemetal" plastic sights.

Does anyone know anything about this thumbrest stippling? Does it tell us anything about when the gun was made?