I am in no way an expert or even close when it comes to something like this, but I would say yes it is a missing "B". I would think it could be like the 1958 Pancho Herrera missing last "A". There are varying degrees of the Herrera variation. I have seen the Herrera with the "A" very faint and it was considered no "A", so I think might be considered the same type of variation.
Just my opinion.
Robert
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