Planchet’s Depression Linked to Embedded Contaminants

V & E Coin News –

By Mike Diamond for CoinWeek… There are many ways foreign (or foreign-looking) material can end up in a coin. It might have been present in the molten alloy, particularly if the material’s melting point is higher than the alloy’s normal constituents. A slag inclusion is one type of “poured-in” error. It could be a minor […]

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