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It may be. It looks like the part, the dimensions match. But I can't find a reference on it to a "B" model. Appears to say model "D" and "DN" what are they?
It says "make from H50" or possibly "A50" do you happen to have that one too?
I myself have never heard of that spec, but a very quick interweb search found some data from CFR Title 14 dated January 1st 1961 (I attach a photo below of my search result).
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