That looks weird. I think it might be PMD. On the edge, is the reeding higher or lower than the blank area? On a partial collar strike, the blank area should extend the furthest outward -- it "squishes out" since it isn't restricted by the collar...
I agree, that is not a partial collar, on a genuine error the reeding would be missing on one side or the other, not both sides with reeding visible in the middle. It could be an ex-jewelry piece, tghat seems like the sort of damage you could get from a bezel.
Sean Reynolds
Incomplete planchets wanted, especially Lincoln Cents & type coins.
"Keep in mind that most of what passes as numismatic information is no more than tested opinion at best, and marketing blather at worst. However, I try to choose my words carefully, since I know that you guys are always watching." - Joe O'Connor
Professional Numismatist, Retired. 55 year member ANA. Former ANA Senior Authenticator. Winner of four ANA Heath Literary Awards; three Wayte and Olga Raymond Literary Awards; Numismatist of the Year Award 2009, and ANA Lifetime Achievement Award 2020. Winner of the PNG's 2026 Robert Friedberg Award for "The Enigmatic Lincoln Cents of 1922," Available now from Whitman or Amazon.
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Sean Reynolds
"Keep in mind that most of what passes as numismatic information is no more than tested opinion at best, and marketing blather at worst. However, I try to choose my words carefully, since I know that you guys are always watching." - Joe O'Connor
TD
See http://www.doubledimes.com for a free online reference for US twenty-cent pieces