Hello Angelo,  You said, "I would like to know more about the plastic
Playrola, if that's possible."

Well, the one I have is the same as yours, and made by Nor-Cos, but on
one of the rolls it said "PlayRola Corp.," but a different town in the
same state, Maryland.  Sorry, but I don't have the roll at present; 
I needed a little repair on my tin-plated one and I left the good rolls
with it.

The little winding handles are the most fragile part and I guess many
have been broken and thrown away.

I wonder if anyone on the list has seen a stock of these rolls in an 
old toy shop somewhere?

Brian Chesters