Not too sure if anyone else has came across this but I found 5 while searching circulated 1949 rolls recently.
If you look on the bottom left of the last 9 you will see notching and 2 different tips of the tails, also you can see some remanence of doubling on the bottom of the loupe of the 9 and the inside of the tail.
Out of 8 rolls I found 5 that look identical to this and the rest looked normal without any signs of doubling.


Finding and discovering modern Canadian doubled die varieties since 2018.
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Modern Canadian Doubled Die Varieties - First Edition
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