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 Replies: 13 / Views: 1,829 |
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Pillar of the Community
United States
751 Posts |
I posted this just to ask for clarification about fins. If the fin is on BOTH Obverse and Reverse of a coin shouldn't they both be on the same side of the coin ? If the fin is on the right side of the obverse of a coin, and you flip the coin vertically, shouldn't the reverse fin also be on the right side of the coin ? In the example I've posted the fins are on opposite sides of the coin once flipped vertically. Dan       Edited by Panther
02/21/2019 10:42 pm
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Bedrock of the Community
United States
74533 Posts |
I've seen fins before, but not many that have 2 fins. It's pretty neat!  Errers and Varietys.
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Pillar of the Community
 United States
751 Posts |
It just struck me as a bit odd.
Dan
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Bedrock of the Community
United States
74533 Posts |
I wonder if both the obverse and reverse dies were tilted during the strike?
Errers and Varietys.
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Pillar of the Community
United States
751 Posts |
That is what I was thinking, but just couldn't imagine that happ3ening ?
I hope we get a few more responses.
Dan
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Bedrock of the Community
 United States
12477 Posts |
If the offset strikes corresponded, then it would be called an "off-center strike." Since they are different, it can only be from the hammer and anvil dies being off in different directions, and possibly tilted. I think it classifies as an interesting MAD example.
In Memory of Crazyb0 12-26-1951 to 7-27-2020
In Memory of Tootallious 3-31-1964 to 4-15-2020
In Memory of T-BOP 10-12-1949 to 1-19-2024
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Pillar of the Community
United States
2775 Posts |
Might check the edge and diameter closer to rule out any wide collar issues. Thanks, Doug.
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Pillar of the Community
United States
751 Posts |
Coop, I would appreciate you chiming in on this.
Dan
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Pillar of the Community
United States
8715 Posts |
Looks like an off center strike.
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Bedrock of the Community
United States
62064 Posts |
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Pillar of the Community
United States
2775 Posts |
Edited by Halo1st
02/22/2019 6:10 pm
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Pillar of the Community
United States
751 Posts |
The coin weighs 3.09g.
The diameter of the coin .750, and .7505 on opposite sides. First is across the Liberty Date plane, The second is Head to Torso plane.
Thickness at (date, .0655), at (head, .0645), at (Liberty, .0625). and finally at the (bottom, .063).
So thickness is fairly consistent.
Dan
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Pillar of the Community
United States
2775 Posts |
The weight is within 3.11 grams +/- .13 grams tolerance.
The diameter in one direction spot on 19.05mm.
The diameter in the other direction is slightly enlarged 19.0627mm.
The thickness exceeds 1.52mm ranging from .0625 inch = 1.5875 millimeter to .0655 inch = 1.6637 millimeter.
Anything showing raised on the edge? If not a bit of collar wear might've helped add some to the effect. If so could be different cause, but similar effect.
Note: When I say raised on the edge does not mean raised on the rim. That's two different things. Thanks, Doug.
Edited by Halo1st
02/23/2019 8:58 pm
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Pillar of the Community
United States
3658 Posts |
It looks like the reverse (anvil) die is an earlier die state than the obverse (hammer) die.
Let me offer a possible scenario for speculation here. Could the double fin be the result of an anvil die change?
Based on the date, unless San Francisco had much better quality assurance measures than Denver, I would think that the press operator would have been the first one to inspect some coins for quality following the die change. The double fin probably wouldn't have been enough to scrap the sample coins in 1970, but probably would have been enough to require adjusting the dies before continuing. If so, there wouldn't have been too many of the double fin coins placed in circulation.
Possibility? Too many "ifs" in the scenario? Is there a better and simpler explanation?
Again, this is just an idea to kick around and maybe prompt some additional lines of thought.
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Replies: 13 / Views: 1,829 |
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Posted 02/21/2019 11:30 pm
