I ran across this rather normal but attractive vintage stock in my travels and bought it more out of curiosity. I've been trying to ID the little bugger but haven't, it's a process...
It does have a 'signature' type shape where the last 3" rear of the receiver fits in. There is a cut-out for something and then two offsets.
I thought I would share some picks with the folks here; maybe someone has seen something like this.