I agree, this is a classic form of Die Deterioration Doubling that you can find on examples ranging from 2010 to 2023 for the 25c denomination and is quite common. Since I have added quarters to the second edition of my book I also included a small section showing common forms of doubling that should be ignored when searching for doubled die varieties on the 25c denomination.
Doubled die varieties for the 25c denomination are very scarce, and that is why I had difficulty finding examples to feature in the first edition of my book, however, I have acquired, and discovered a handful of examples that are featured in the Second Edition, so keep searching, they are out there.
Finding and discovering modern Canadian doubled die varieties since 2018.
2023 Recent Publications: Modern Canadian Doubled Die Varieties - First Edition PDF & Paperback https://www.mcddv.ca (website currently down for maintenance as of 08/01/2024)
I have debated this form of doubling in this forum on several occasions. In my opinion, it is a form of DDR. Here are two pictures from 2012 where you can clearly see the split at the tips of the antlers and the top of number 2.
Imprecise cutting of the die. The sides of the incused part of the die weren't perfectly smooth (hard to cut perfect sharp-angle corners into the die), and the arrows point to telltale marks left on the raised parts of the coin.
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