Pulled out my set, and looking at it, I don't think it's a stray period. The O in Outfield lines up directly under the J in Jay, just like the other cards in the set. If it was a stray period, it would have pushed "Outfield" over.
Additionally, Fleer was known to correct any errors in the Glossy set. If you look at COMC, you'll see that all 9 base cards have it and the 8 Glossy cards have it as well. I don't believe it ever was "corrected". (Also not convinced it's nothing more than a speck that was on the plate that was never detected.)
-- Dan --
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