Quote:
It's not likely the extra detail would have been on the die. The error is that the coin was struck on foreign coin as planchet.
Numismat, are you suggesting this coin was re-struck on another coin? I'd like to hear more about your ideas on this one.

I think this coin presents an interesting thought-problem, since the underlying mark is rather confusing, compounded by a somewhat non-standard design, ie the struck details are below the fields in this series. So here are my thoughts for several different scenarios.

A. This coin was struck in the Sweden mint on a previously-struck foreign coin bearing an incuse "5 O"--rather unusual for any coin. Since the die setup in this case is non-standard; the incuse areas would get the highest striking pressure, such as the oval depression around the large "5" on the obverse. One would think, if a normal 5 Ã-re were struck on the host coin, there would be remnants of the design in lower-pressure areas such as inside the large "5". More notably, the higher crown details around the underlying "5 O" would contain the design too--since they represent lower die pressure against the host coin. Since we're seeing the opposite here--the "5 O" remains in more incuse areas, I suspect some other process produced these marks.
B. First,
an article written on this variety by the former director of Sweden's mint. While my knowledge of Swedish is limited, I understand that Mr. Almqvist thinks two different impressions on the die were made to create this variety. One possibility: a tool bearing a right-reading, incuse "5 Ã-" was impressed into the die blank, leaving a raised mirror image. Whatever this blunder entailed, it would be followed by a normal hubbing process. Predictably, the hub design would obliterate raised die surfaces where the "5 Ã-" crossed the details of the crown. And this is exactly what we see on the resulting coin. The real mystery is...what coin was this "5 Ã-" punch from? Was this die part of some design trial, re-used for normal coin strikes?
As the article states, several examples of this coin were found--which suggests it's a die variety and why I posted this--a heads-up for collectors.
Update: It appears that
Krause recognizes this variety.