If you have access to a copy of "The Complete Guide to the Buffalo Nickel" ( a must have for any Buffalo collector) ... it has a nice page with pics and descriptions of all 8 varieties of the 1938 over/mintmarks...
Frankly, it is hard to tell from the pics...but it looks like a little something going on on the top of the D.
Re: Slabbed coins - There are some coins that LIVE within clear plastic and wear their labels with pride... while there are others that HIDE behind scratched plastic and are simply dragged along by a label. Then there are those coins that simply hang out, naked and free
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Frankly, it is hard to tell from the pics...but it looks like a little something going on on the top of the D.