Bulged die

bulged die: a coin with wavy, concave or convex surfaces caused by a defective stamp.
bullion: raw metal, usually gold or silver in ingot form.
bullion coin: a coin that has no collector premium above the value of its metal.

bulged die
A die that has a small indentation formed in it, producing coins with a bulged area.
bullion ...

bulged die A die that has clashed so many times that a small indentation is formed in it. Coins struck from this die have a "bulged" area.
bullet toning See also target toning.

Bulged die
A die with a small indentation, formed from clashing. Results in "bulged" coins.
Bullet toning ...

See also: Surfaces, Mint, Gold, Alloy, Luster