What I am referring to is the weakness seen along the opposite sides of this coin. It comes from being struck on a planchet that was cut from a rolled out fillet ingot that was too narrow. It is something I saw in the coins made in New Bedford after 1880 for the China trade. Some genuine coins have the same defect but not as often as the silver copies do and it is always confined to one side.
The fillet ingots were the small thin ingots of silver poured so that they could be rolled out into a strip of material just over the diameter of one planchet and several feet long. After rolling and laminating the silver ribbon the thickness of a planchet was punched to produce a planchet. I discovered in my research that it was John Riddell who design the fillet casting machine used at the US mints for about half a century.
The picture below illustrates the flattening of the fillet into a silver strip the proper thicknes.
This is a cross section of a fillet ingot that may have started out being too thin.
Below is the strip showing blanks punched from the strip.
Finally a planchet with tapered sides opposite one another. The shaded area is thinner than the rest of the planchet and does not strike up well. This translates to areas of weakness which are always on opposite sides. The common mint error involves weakness along one side due to punching too close to the edge of the strip. The feature common to the "Boston" counterfeit group is a silver strip so narrow that weak areas occur on both sides of the planchet.
I hope that explains what I mean.
My book on Counterfeit Portrait 8Rs is available from Amazon http://ccfgo.com/TheUnrealReales
or from me directly if you want it signed.
Edited by swamperbob
11/28/2020 7:54 pm