[Digger]

all that I have looked at is labeled 38 Special or 38 S&W Special on the box and cartridge head stamp. 38 S&W is a shorter and fatter cartridge that will not chamber in a 38 special. disclaimer: if I’m wrong I have no doubt that one of the other, more knowledgeable members will be along to politely correct me.
The extra piece on the grip looks like an early “Tyler T-Grip” and enhances control of the revolver.