Is this dial blank a standard Western Eelctric part?

[allnumbedup]

I have seen before the acetate dial cards with the exchange name and individual numbers held in pockets on the back, but what is the case on the back of this dial blank? It appears to be some sort of fiber, not the typical plastic or metal used in other dial blanks and has no terminal strip for the dial leads.

[G-Man]

The backside of the dial blanks that I have in this style, have what seems to be zinc alloy weights that are shaped like the one shown in your photograph.
 
I once had several large boxes of them that I found in a telco warehouse. They ended up there after being removed from deskstands and 10x-type vintage sets that had dials installed in their place when automatic service was first introduced in an exchange.
 
I only have a few left since I had given many of them away at telephone shows over the course of many years.

[poplar1]

The dial blanks for the 50AL, 102, and 202 do not have terminals on the back.