How does a in-collar, rotated double-struck error happen?
Zoins
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Just ran across this interesting error. It's neat that the double struck denomination is rotated 90 degrees.
PCGS calls this a “Double Struck in Collar” error. My understanding is that after a coin is struck it expands and cannot be fitted into a collar again so my question is that if it expands after the first strike, how does it rotate in the collar to be struck a second time? I imaged a coin would be too tight to rotate in-collar after a first strike, but perhaps not?
How does this happen?
cc @FredWeinberg, @Byers , @ErrorsOnCoins, @dcarr
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With the assistance of someone at the mint, I bet.
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Even with assistance, I wonder how it physically happens.
How does a coin that's struck once rotate in collar to be struck again with a different rotation in collar?
Strike, open collar, reposition, close collar, strike?
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Perhaps if a multi-part collar was used. And even if so, would fitting the coin back in be difficult due to expansion? Did the Mexico Mint use multi-part collars?
I know Dan's press uses a single piece collar and the coin can't be fit back in after ejection.
Dan's Grabener press was originally in service from 1986 to 2001 and this is a 1990 coin.
I wonder if the diameter and thickness of this coin might clarify the restrike? Peace Roy
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Am no expert. Perhaps this coin was struck similar to the OP's coin ????
https://forums.collectors.com/discussion/1020119/here-is-a-interesting-recent-purchase-of-a-1967-1-canada-goose#latest
That's a good example too!
I'm wondering how that happens mechanically.
Nobody seems to want to venture a guess??????????
Seems that this particular coin can have many types of errors, found this on ebay:
https://www.ebay.com/itm/Set-of-six-1990-Mexico-100-000-Pesos-PATTERNS-and-ERRORS-all-PCGS-graded/274129543952?hash=item3fd364e310:g:47IAAOSwMqZc7dJQ
If you can get it out of the collar after striking, you can get it back in. The coining press is pretty strong!
How many (and how many different kinds) of errors can you have with patterns? Shouldn't be many. This one is almost certainly mint sport.
I believe the answer is simpler
The coin is struck normally and ejected. Then, it gets stuck in the tote bin and not emptied out. Same tote bin is refilled with blanks and the coin goes back in the press for a second round.
I've seen such cases of flip over double strike rotated in collar. I think the coin just had two separate rounds through the machine.
This is similar to "double denominations", eg cent on dime, where a struck coin is mixed with blanks and fed again but to a different press for a different denomination.
I think several options are available, either the previous post/rotation between strikes, setting up the press with a new die or someone was having a bit of fun. The first option would be quite serendipitous to get an exactly 90 degree rotation (but not impossible). Double struck coins with a rotation of 10 or 20 degrees are quite common. The second may depend on the number of faces to the fixing lug on the die. If it is square, or a multiple of 4 then you can easily take out the die, fit a new die and make a one-off strike using an existing coin as a 'blank' in the correct position (90 degrees out) and arrive at the observed by accident. Third option is a (deliberate) variation on the second, but you could never tell which was which.
If you're striking a pattern, does it get dumped into a tote bin with a bunch of previously struck pieces?
I was serious about my answer. These errors were created intentionally.
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Of course they were, and as such, they're not really errors.