Uncentered broadstrike (Off center) - Errors and varieties
In addition to the obverse die (anvil) and the reverse die (hammer), striking a coin requires a third die called collar. This collar makes it possible to obtain a precise diameter for each coin of the same denomination and it contains the overflow of the metal when the blank is struck.
Sometimes a blank does not fall completely into the striking chamber. This blank may partially rests on the collar (off centered). When this happens, it is partially struck. The collar, by the pressure of the strike, will follow the downward movement and then rise again without the coin being folded up, then it will be ejected normally.
This coin is struck on both sides almost identically in percentage, which differentiates this error from a misaligned die.
How to calculate the percentage of an uncentered broadstrike
To calculate the percentage, it is necessary to measure the missing part of the design in relation to the diameter of the coin. A/(A+B) = %.
Uncentered broadstrike value
The value is based on the percentage, date of the coin, grade and denomination. Uncentered broadstrike coins with visible date will be more valuable than coin withtout the date. Here are some prices realized at auctions:
- $1,625 CAD - 7% - 1 dollar 1968 PCGS PL-67
- $1,500 CAD - 15% - 25 cents 1875 PCGS G-4
- $830 CAD - 10% - 5 cents 1872 CCCS VG-8
- $500 CAD - 35% - 25 cents 1973 UNC
- $240 CAD - 30% - 1 cent 1963 NGC MS-63
- $230 CAD - 5% - 1 cent 1859 Narrow 9 PCGS VF-20
- $150 CAD - 10% - 10 cents 1963 CCCS MS-62
- $100 CAD - 35% - 10 cents 1960 PCGS MS-60
- $140 CAD - 15% - 1 cent 1969 CCCS MS-64
- $65 CAD - 15% - 1 cent 1968 UNC