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    1869 Ten Cent 'Koulz's Alloy'
    Judd-717A, PR64
    Alloyed With Traces of Iron and Silicon

    1869 10C Ten Cents, Judd-717A, Pollock-798, High R.7, PR64 PCGS Secure. 44.13 grains. 75% copper, 25% nickel. The obverse is similar to the regular issue, but without the date in exergue. The reverse has SIL. / NIC. / COP. in the center with the date slightly curved below and in a smaller font. This second reverse design pattern has a reeded edge. The reverse states it was struck in the unworkable alloy of silver, nickel, and copper: Koulz's alloy. However, this example proved to be composed of a most interesting alloy when SEM-EDX testing was conducted by QC Metallurgical on certificate number 60944.64/21873031: 76.07% copper, 23.42% nickel, 0.27% iron, and 0.24% silicon. This piece was originally attributed as a Judd-716 (Koulz's alloy), but after metallurgical testing was done it was reholdered as a Judd-717A (mostly nickel) striking. The difference between the two cannot be discerned by appearance, weight, or specific gravity; only SEM-EDX testing can differentiate between the two alloys. Since we last saw this piece it has been retested and it now shows a slightly lower percentage of copper and slightly higher percentage of nickel, no other trace elements are mentioned on the PCGS insert. The weight is also different. Formerly it was 44.3 grains, now it is 44.13 grains. The piece looks like other nickel patterns we have seen with subdued mint luster. The strike is surprisingly strong for a composition as hard as this one. Moderate reflectivity is seen in the fields and the devices are notably frosted, yielding significant contrast. Light gray-rose toning is seen over each side. An irregular planchet flaw in the right field serves as a useful pedigree identifier.
    Ex: eBay offering #391360575 (2004) by Blue Moon Coin; David Cassel; David Cassel Collection / ANA Signature (Heritage, 8/2015), lot 5964.

    Coin Index Numbers: (NGC ID# 29S2, PCGS# 60944)

    View Certification Details from PCGS

    Auction Info

    Auction Dates
    Apr-May, 2016
    27th-1st Wednesday-Sunday
    Bids + Registered Phone Bidders: 8
    Lot Tracking Activity: N/A
    Page Views: 489

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