Dime on wrong planchet?

Discussion in 'Error Coins' started by Serich1980, Jul 19, 2014.

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  1. doug444

    doug444 STAMPS and POSTCARDS too!

    Some of the Filipino dimes struck 1937-1945 came from the Denver mint. They weighed 2.000 grams and were 75% silver, diameter 16.7 mm. See Krause.
     
    doug444, Jul 19, 2014
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  3. ToughCOINS

    ToughCOINS Dealer Member Moderator

    The weight of a cylinder varies in direct proportion to the square of its diameter.

    Presuming that the coin you have is a modified silver Roosevelt dime, I figure the diameter of your coin to be approximately 13.4 mm or 17/32" in diameter.

    How close it that t what you have?
     
    ToughCOINS, Jul 19, 2014
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  4. Serich1980

    Serich1980 Member

    I'll get you the width ASAP. I haven't measured it. Interesting though :)
     
    Serich1980, Jul 19, 2014
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  5. doug444

    doug444 STAMPS and POSTCARDS too!

    It's the square of the radius, not the diameter...
     
    doug444, Jul 19, 2014
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  6. ToughCOINS

    ToughCOINS Dealer Member Moderator

    It's both . . . (PI)*R^2 = (PI)*(D/2)^2

    I just provided the diameter instead of the radius because it is too difficult to measure the radius of a coin.
     
    ToughCOINS, Jul 19, 2014
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  7. doug444

    doug444 STAMPS and POSTCARDS too!

    The square of the diameter divided by two, which most folks would forget to do; otherwise you introduce a 4X error.
     
    doug444, Jul 19, 2014
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  8. Serich1980

    Serich1980 Member

    It's 19 mm. 24/32 or 3/4 inch. It's getting good now.
     
    Serich1980, Jul 19, 2014
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  9. ToughCOINS

    ToughCOINS Dealer Member Moderator

    That's accounted for in my calculation of the estimated diameter of 13.4mm.

    1.4 / 2.5 = [PI*(D/2)^2] / [PI*(17.9/2)^2]

    The PI and the 4 are in both the numerator and denominator, and thus cancel out of the solution.
     
    ToughCOINS, Jul 19, 2014
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  10. doug444

    doug444 STAMPS and POSTCARDS too!

    doug444, Jul 19, 2014
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  11. ToughCOINS

    ToughCOINS Dealer Member Moderator

    Would you mind double-checking your measurement?

    A normal dime is smaller than that . . . 17.9mm, or 0.70 inches.
     
    ToughCOINS, Jul 19, 2014
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  12. Serich1980

    Serich1980 Member

    I'll double check it as soon as I get a chance. I may have made a mistake.
     
    Serich1980, Jul 19, 2014
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  13. Serich1980

    Serich1980 Member

    Correction 15 mm or .59 in.
     

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    Last edited: Jul 19, 2014
    Serich1980, Jul 19, 2014
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  14. ldhair

    ldhair Clean Supporter

    You might double check the weight as well.
     
    ldhair, Jul 19, 2014
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  15. Serich1980

    Serich1980 Member

    It weighs 1.4 grams. Its 15mm wide. It appears to be a 90% silver but I'm not sure on that. It isn't a clad dime though.
     
    Serich1980, Jul 20, 2014
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  16. d.t.menace

    d.t.menace Member

    We checked the weight and diameter but not the thickness. If that's the same or close to specs then it would be underweight at a 15mm diameter.
    I think there's little doubt it's a modified dime, whether in a dryer or some other means.
     
    d.t.menace, Jul 20, 2014
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  17. Briboy07

    Briboy07 Well-Known Member

    Wow it should be 2.5 grams I believe if it is a silver dime. That is a lot of weight to lose. A dryer coin may account for PMD as in messed up looking dates, lettering, dents and maybe even bowing do to extreme heat, but shrinkage and weight loss???
     
    Briboy07, Jul 20, 2014
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  18. Briboy07

    Briboy07 Well-Known Member

    I have seen coins modified for pendants on necklaces and for rings encased in gold and always wondered why ruin the coin, why not just encase it they way it is, but some jewelers see it differently and create their art.
     
    Briboy07, Jul 20, 2014
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  19. Serich1980

    Serich1980 Member

    How do u measure thickness? What if it is a dryer dime that was struck on wrong planchet to begin with? I'm not gonna think about it anymore.
     
    Last edited: Jul 20, 2014
    Serich1980, Jul 20, 2014
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  20. doug444

    doug444 STAMPS and POSTCARDS too!

    There is also a possibility that the coin was treated with some kind of acid, just for fun. Not sure what the results would be, but definitely smaller and lighter. Nor do I know which acids affect silver, there's bound to be some. Just an idea.
     
    doug444, Jul 20, 2014
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    Serich1980 likes this.
  21. d.t.menace

    d.t.menace Member

    1. micrometer/calipers
    2.think occams razor
    3.good idea
     
    d.t.menace, Jul 20, 2014
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    Serich1980 likes this.
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