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354 EFS challenge coin 354 EFS challenge coin by Gray Water Ops, LLC Here is an image of the first coin minted from a recent 354 EFS challenge coin order. This is a 1.75″ shiny silver nickel coin with 3D detail on both sides, hand painted, sand blasted with an epoxy finish. This beautiful coin …

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When a custom coin is designed and minted, the areas that are to be painted have a raised metal wall around the area, to hold the paint. If you imagine the design like a coloring book, any area that needs color has to have a raised wall around it. This challenge coin, designed for the …