First Page
Posted 09/01/2023 02:27 am
I agree with many of the comments, the coin is a CCC type. Dies are hand cut and very nice. Unrelated to any family established to date.
One comment has to be reinforced. It is that Sheffield Plate counterfeits not only were the perfect color (outer layer was 90% silver and 10% copper) but the coin would ring like a genuine coin. Unlike most counterfeits Sheffield Plate was fully bonded (melted together) and it passed the ring test (to the limits of human hearing). That is why it was so successful at the time. I have never heard of the "pingcoin". It sounds in principle like there should be a detectable difference in frequency between 90% silver alloy solid and a Sheffield Plate, but I would have to test the application before I accepted it.
Roma and anyone else interested - the best tests when looking for counterfeits are weight, specific gravity and XRF analysis. Very few counterfeits pass all three tests. The first two are easy and not expensive at all if you have a decent scale.
I am still surprised by how many collectors still are not using SG testing. Weight divided by volume equals Specific Gravity. It is just that simple.
One comment has to be reinforced. It is that Sheffield Plate counterfeits not only were the perfect color (outer layer was 90% silver and 10% copper) but the coin would ring like a genuine coin. Unlike most counterfeits Sheffield Plate was fully bonded (melted together) and it passed the ring test (to the limits of human hearing). That is why it was so successful at the time. I have never heard of the "pingcoin". It sounds in principle like there should be a detectable difference in frequency between 90% silver alloy solid and a Sheffield Plate, but I would have to test the application before I accepted it.
Roma and anyone else interested - the best tests when looking for counterfeits are weight, specific gravity and XRF analysis. Very few counterfeits pass all three tests. The first two are easy and not expensive at all if you have a decent scale.
I am still surprised by how many collectors still are not using SG testing. Weight divided by volume equals Specific Gravity. It is just that simple.
