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 Replies: 14 / Views: 2,497 |
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New Member
United States
42 Posts |
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New Member
 United States
42 Posts |
Additional Info: The last 2 photos are of strange edge lettering on Tyler, Polk and Sacagawea dollars also from 09 mint sets. The weight of the Philadelphia half dollar is also inconsistantly a 1/10th a gram < (+/- .003) than the Denver coin Both coins consistantly shared the US Mints specified 30.6mm diameter. |
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Pillar of the Community
 United States
4589 Posts |
The diameter is all that really matters, so they can be rolled together. The thickness difference is covered up by the way the wrapping machines form their rolled edges.
The weight difference is within spec, but interesting... I wonder what the gravitational difference between sea level and 5000 feet is. Surely can't be enough to measure...
-----Burton 50+ year / Life / Emeritus ANA member (joined 12/1/1973) Life member: Numismatics International, CONECA Member: TNA, FtWCC, NETCC, EveryCountry (online) coin club Owned by three cats and a wife of 40+ years (joined 1983) Author: 3rd Edition of the Sample Slabs book, https://www.sampleslabs.info/ |
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Pillar of the Community
Canada
5239 Posts |
Quote:
The weight difference is within spec, but interesting... I wonder what the gravitational difference between sea level and 5000 feet is. Surely can't be enough to measure...
This may come as a surprise to some people, but according to a Wikipedia article, the strength of gravity on the earth is not uniform but varies 0.7% from the strongest to the weakest. It tends to be higher in mountain ranges and lower over deep ocean trenches. That's about +/- 0.01 gram for a 1 cent coin. Also, in determining thickness, consider that it would depend on exactly where on the coin you put the calipers and how tightly you squeeze the coin in the calipers. Measuring diameter would have fewer sources of error. |
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New Member
United States
42 Posts |
Pertending I had no idea how to measure, I still got contstant 2.15mm from one mint 15 times. I can not find a modern half dollar that measures anything other than 2.15mm. Yet phily put out somthing 2mm thick and am curious if anyone knew anymore as to why this would happen
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Pillar of the Community
Canada
5239 Posts |
Well, @Face33, in that case it is likely a real difference. Not that I can explain why.
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New Member
United States
42 Posts |
And I guess the final question really relates to is it unique is in error and is it valuable
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Pillar of the Community
United States
1657 Posts |
I expect they just got some planchet stock that was rolled a little thin. You could check some other years and see if there is a pattern. You say many of the Philadelphia coins are thinner so it certainly isn't unique. I can't imagine there would be any premium for such a small difference but you could research it some more.
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New Member
United States
42 Posts |
I will continue to endevor to do so and will update here.
Any thoughts on the reed markings on the dollar coins?
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New Member
United States
42 Posts |
Found this....
31 U.S. Code § 5113.Tolerances and testing of coins
U.S. Code
Notes
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(a)The Secretary of the Treasury may prescribe reasonable manufacturing tolerances for specifications in section 5112 of this title (except for specifications that are limits) for the dollar, half dollar, quarter dollar, and dime coins. The weight of the 5-cent coin may vary not more than 0.194 gram. The weight of the one-cent coin may vary not more than 0.13 gram. Any gold coin issued under section 5112 of this title shall contain the full weight of gold stated on the coin.
(b)The Secretary shall keep a record of the kind, number, and weight of each group of coins minted and test a number of the coins separately to determine if the coins conform to the weight specified in section 5112(a) of this title. If the coins tested do not conform, the Secretary—
(1)shall weigh each coin of the group separately and deface the coins that do not conform and cast them into bars for reminting; or
(2)may remelt the group of coins.
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Pillar of the Community
United States
1657 Posts |
Just a guess here, but I think the marks on the edge of the dollar coins are shear marks from when the blanks were punched out.
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New Member
United States
42 Posts |
Not likey on the sheer marks and these are tmfrom the mint set, you would think they would have the clad as clean as ecery previous year. Idk still to many unknowns. Ill keep searching.
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Bedrock of the Community
United States
17884 Posts |
As I have pointed out many times, thickness of the rims (and the rims tend to be the thickest part of the struck coin) tends to be a function of the strike. The better struck the coin is, the more the rims fill and the thicker the coin is at the rim.
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Valued Member
United States
493 Posts |
Interesting mint set. Face value 14.38. Apparently it won't hardly sell at double face currently. I see on ebay the sets get broken up and cents are up for sell, 771,000 mintage on the 2009 mint set, makes the satin pennies, 2nd lowest mintage for the series. Even the dimes for that year were lower mintages. I could maybe ask, why would someone cut up 30 sets, how many sets will be left, not a mint set expert, interesting how mint set mintage numbers are falling, nobody wants them. |
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New Member
United States
42 Posts |
I have noticed the trend, perhaps a bubble, much to early for its time, bursting as it should to lay way for the collector looking to invest in something that rightly won't come to a true peak for many years to come. The quick buck is always of the flammable type.... or so I have learned.
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Replies: 14 / Views: 2,497 |
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Posted 12/21/2019 10:29 am
