1939 Proof Washington Quarter Re-Engraved Details varieties

I noticed a while ago that a few years of Washington quarter proofs have re-engraved details on the ribbon, and I have not found other research into these. Has anyone else noticed these?
http://www.pcgs.com/SetRegistry/publishedset.aspx?s=142753
https://www.autismforums.com/media/albums/acrylic-colors-by-rocco.291/
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ya. they been around several years now at least (attributed by tpg).
they are not the only coin type that has accepted REDs and there are even more without acceptance.
some years exhibit more than one area and more than one mint.
i'd say by in large, there are MANY not officially attributed for those that want to buy some up to speculate and/or have fun.
@Aspie_Rocco, Yes since this is my main series I do notice these. However, there are so many varieties on both obverse and reverse for almost every year that it would be really time consuming and painstaking to publicize them all in something such as the Cherrypickers Guide for limited collector interest.
Roger Burdette does mention almost all of not every variety of recut dies for every year in his book on these proofs. Collector interest, however, is very limited and only very avid collectors would use this to identify die pairs that had good detail for premium quality coins. So they aren’t buying the recutting to have the variety but a coin with slightly better detail if the die offered it. Many will just choose a coin that was struck by new dies. Good observations!
Coin Photographer.
I was surprised to see the wings on some from 1939 were re-engraved