S&R on ford script plyers ?

Just wondering what I found it's a normal ford model a plyers but along with th ford script it has S&R. Odd, rare, common ? Let me know what you think.
 
I never thought to look, but I have seen such marks on other parts that were supplied by Ford. I always thought they were manufactures marks. I once had a waterpump with G.M. cast in it always got a laugh.
 
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