Clipped planchet errors occur when the blanking press creates an incomplete coin blank — missing a curved, straight, or irregular portion of its edge. The resulting coin shows a distinctive area where metal is absent, and genuine clips carry a telltale authentication marker: the Blakesley effect on the opposite rim.
During coin blank production, circular blanks are punched from a long metal strip. If the strip doesn't advance properly, the next punch overlaps the previous hole, cutting into it. The resulting blank has a bite-shaped clip where it overlapped. Straight clips occur when blanks are punched too close to the edge of the strip.
Clip values depend on the clip size (larger clips are scarcer), type (straight and multiple clips carry higher premiums), denomination, and condition. The presence of a clear Blakesley effect adds authenticity confidence.
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Scan Your Coin NowThe Blakesley effect is a weak or flat area on the rim directly opposite a clip. It occurs because the incomplete blank couldn't flow properly during the rim-raising (upsetting) process. It is the primary authentication marker for genuine clipped planchets.
Check for the Blakesley effect (weak rim opposite the clip), smooth edge at the clip area (no tool marks), and metal flow distortion in the design near the clip. Post-mint damage lacks these features.
Small clips carry smaller premiums than large ones. However, even small clips on less common denominations or with unusual characteristics can be collectible. Large clips (25%+ of the coin missing) are significantly more valuable.
Yes, clipped planchets occur on all denominations since all coin blanks are punched from metal strips using the same basic process.