Broadstrike Error Coins

Specifications

Denomination: multiple
Series: Mint error types

A broadstrike happens when the collar die fails and the coin spreads wider than normal with a plain, reedless edge and a full, centered design. Common-date broadstrikes are worth only a little over face value — but the two known broadstruck double eagles are major rarities, with the 1904 bringing $60,000 at Heritage in 2024.

What it is

A broadstrike is a striking-stage error: the coin was struck with the collar die — the ring that holds the planchet in place and impresses the edge reeding — malfunctioning or failing to engage (Wikipedia — Mint-made errors; Stack’s Bowers — Broadstruck Double Eagle Presents Collectors an Opportunity to Own a “Plain Edge” $20; accessed 2026-09-17).
The coin spreads outward under the press’s enormous pressure, expanding beyond its normal diameter, with a full centered design but a plain edge (Wikipedia — Mint-made errors; accessed 2026-09-17).

How it happens

Under normal striking, the collar die surrounds the planchet and constrains its diameter while also impressing the edge reeding as the dies come down (Wikipedia — Mint-made errors; Stack’s Bowers — Broadstruck Double Eagle Presents Collectors an Opportunity to Own a “Plain Edge” $20; accessed 2026-09-17).
If the collar fails to engage or malfunctions, nothing constrains the metal when the dies strike — the planchet spreads wider than normal and distorts slightly under the pressure (Wikipedia — Mint-made errors; accessed 2026-09-17).
Because the strike itself is otherwise normal, the full design lands centered — just on an oversized blank (Wikipedia — Mint-made errors; accessed 2026-09-17).

How to identify

Check three things: an oversized diameter, a full centered design, and a plain edge with no reeding (Wikipedia — Mint-made errors; Stack’s Bowers — Broadstruck Double Eagle Presents Collectors an Opportunity to Own a “Plain Edge” $20; accessed 2026-09-17).
Check the edge first: the plain, reedless edge is the single most important diagnostic, since every broadstruck U.S. coin lacks edge reeding (Stack’s Bowers — Broadstruck Double Eagle Presents Collectors an Opportunity to Own a “Plain Edge” $20; accessed 2026-09-17).
The full design is what rules out an off-center strike — off-centers are missing part of the design, while a broadstrike shows all of it (Wikipedia — Mint-made errors; accessed 2026-09-17).

Real error vs. post-mint damage

A genuine broadstrike shows one clean, full strike — simply spread wider than normal with a plain edge (Wikipedia — Mint-made errors; accessed 2026-09-17).
A coin flattened in a vise or hammered after leaving the mint shows smeared, distorted design details and tool marks — that is post-mint damage, not a mint error (Wikipedia — Mint-made errors; accessed 2026-09-17).

Notable examples

1904 Liberty Head double eagle, broadstruck, MS-64 NGC, realized $60,000 at Heritage, August 2024 (Stack’s Bowers — Broadstruck Double Eagle Presents Collectors an Opportunity to Own a “Plain Edge” $20; accessed 2026-09-17).
1906-D Liberty Head double eagle, broadstruck, AU-58 NGC — one of only two broadstruck double eagles known among all circulation double eagles struck 1850 to 1932 (Stack’s Bowers — Broadstruck Double Eagle Presents Collectors an Opportunity to Own a “Plain Edge” $20; accessed 2026-09-17).
1999 Lincoln cent, broadstruck with reverse die break, MS66 Red NGC (Heritage; accessed 2026-09-17).

What drives value

Rarity and denomination dominate: a broadstruck double eagle is a major rarity on the six-figure scale, while a broadstruck modern cent is a minor error (Stack’s Bowers — Broadstruck Double Eagle Presents Collectors an Opportunity to Own a “Plain Edge” $20; accessed 2026-09-17).
Honest floor: common-date broadstrikes (like modern cents) are minor errors worth only a little over face value — a few cents to a few dollars over face (Dr. Sol Taylor (The Signal) — What is a Mint Error Worth?; Stack’s Bowers — Broadstruck Double Eagle Presents Collectors an Opportunity to Own a “Plain Edge” $20; accessed 2026-09-17).