Is this a 1950 s/d rpm?

I think it is based on other pictures.

 

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Or just a s/s

 

I think it is just a worn "S" (singular).

Chris

 

I don't think it's from wear in the middle. It's something. S/S at least. I got more samples to identify with.

 

Here is another 1950 s that has more wear

 

And another one I have