A broadstrike error occurs when a coin is struck outside the retaining collar — the ring that normally keeps the coin round and gives it its reeded edge. Without the collar, metal spreads outward freely, creating a coin that is larger than normal, flat on the edge, and missing its reeding. Broadstrikes are recognizable collector errors found across many denominations.
During normal coin production, the planchet sits inside a collar die that constrains it during the strike. If the collar fails, moves, or is missing, the metal expands freely. The result is a broader, thinner coin with no reeded edge and design elements that appear spread or distorted near the rim.
ErrorHunt is an AI-powered coin error detection platform designed for collectors, treasure hunters, and anyone curious about the value of their coins.