Minimally expanded broadstrike with mirror brockage
- I liked the look of this 1963 Canadian cent with a mirror brockage of the reverse design on the obverse face:
The reverse design is struck by the hammer die, so this would be the equivalent of a Lincoln cent with a mirror brockage of Lincoln's bust on the reverse face.
I initially thought this was an in-collar, first-strike brockage. The coin doesn't appear to be expanded at all in the photos and the right side of the die-struck reverse face appears to show a fin. However, the appearance of a misalignment on the die-struck side led me to consider another possibility -- that this coin had actually been struck out-of-collar.
When I got the coin I cracked it out. Weight falls within normal parameters at 3.25 grams (normal average is 3.24 grams in this time period). The edge shows the convexity typical of an unstruck Canadian cent planchet. There is no evidence of collar contact. Diameter is 19.38mm, which is 0.33mm greater than a normal cent.
There can be no doubt that this coin was struck out-of-collar. The "fin" is not a fin at all. It's simply a thin unstruck crescent of the planchet that sits at a level higher than the design rim. The strike must have been too weak to generate any siginficant expansion, but strong enough to create a perfect strike and a perfect brockage.
The uncentered die-struck obverse probably reflects a slightly off-center positioning of the planchet. But another possibility is that the planchet and the underlying coin were both perfectly centered but both received a strike from a horizontally misaligned hammer (reverse) die.
I have no way to determine if the bottom coin was fully confined by the collar, partly confined by the collar, or unconfined by the collar.
I have seen a number of similar errors over the years, including the 1964 nickel posted in the brockages album.