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A broadstruck coin is formed when the collar is not surrounding the planchet during the strike.
The collar should completely surrounds the reverse die to help hold the planchet in place during striking. This helps the detail form on the coin and helps form the edge of the coin. On coins with reeded edges, the reeding design is in the collar. When the metal is forced against the collar, the reeded edge is formed.
The collar floats on springs independent of the die. Thus the collar can be down or at an angle when the planchet is struck. If the collar was attached to the coinage press in a fixed position, it could result in serious damage if the die struck the planchet incorrectly.
If the collar is not in the proper position when the planchet is struck, it allows the metal to be distorted outward. If the collar is jam on one side but not the other, you will get a partial collar strike. On reeded coins, the reeding will not show completely around the coin.
If any part of the design is missing on the coin, it is not a broadstruck, it is an off center struck coin.
This coin is the size of a quarter.
This is a broadstruck Jefferson Nickle.
It was sent to us as struck on wrong metal. It is the correct weight and same specific gravity as a nickel.
1984 P Broadstruck Roosevelt dime: Notice that only the left side of the coin was struck without a collar. This would be a partial collar Broadstruck coin.
The collar places the reeded edge on this coin. The side that was struck without a collar will not have a reeded edge.
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