It looks like PCGS pulled the 1937 DDO Requirement from the Mercury Variety Set

It was there for a bit a time, and now its gone. I wonder what other changes they are making. It is sure confusing with the change in and out.
President, Racine Numismatic Society 2013-2014; Variety Resource Dimes; See 6/8/12 CDN for my article on Winged Liberty Dimes; Ebay
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Looking for Top Pop Mercury Dime Varieties & High Grade Mercury Dime Toners.
Hoard the keys.
There are 7 DDOs for the date. It would require a good amount of study to figure out which one you have because they are so similar. I used to own one but got rid of it since it was not a part of the PCGS Registry set and it had a bad "issue."
Oh, and the coverage of the variety in the CPG is terrible. They mention the primary PUP as IGWT and then show a photo of the Designer's Initials. Really really Bad. They do mention the date but the date is the strongest thing to notice in all 7 of them, fyi.
Before I knew what the heck I was doing...here is a photo of the one I had.
Looking for Top Pop Mercury Dime Varieties & High Grade Mercury Dime Toners.
Looking for Top Pop Mercury Dime Varieties & High Grade Mercury Dime Toners.
Hoard the keys.
Looking for Top Pop Mercury Dime Varieties & High Grade Mercury Dime Toners.
Edited to add;
Ricc, thanks for bringing this to my attention, Cherrypick isn't a dirty word!