Clipped Planchet Errors: Types, Identification, and Collecting

A clipped planchet error occurs when the metal strip used to punch out coin blanks overlaps with a previously punched hole, resulting in a blank that is missing a portion of its edge. The coin struck from this incomplete blank shows a characteristic curved or straight clip where metal is absent. Clipped planchets are one of the more commonly encountered mint errors and come in several distinct types.

What Causes Clipped Planchets?

Coin blanks are punched from long strips of metal by a blanking press. After each punch, the strip advances forward so the next blank can be cut. If the strip doesn't advance far enough, the next punch overlaps with the previous hole, creating a blank with a curved bite taken out of it. This curved clip mirrors the shape of the previously punched hole.

Types of Clipped Planchet Errors

• Curved clip — the most common type; a crescent-shaped piece is missing from the edge, matching the curve of an adjacent punching hole
• Straight clip — a straight edge is missing, caused when the blank was punched too close to the end or edge of the metal strip
• Ragged clip — an irregular, torn edge caused by the strip tearing during the blanking process
• Multiple clips — two or more clips on the same coin, which are considerably scarcer
• Elliptical clip — an oval-shaped clip caused by a specific strip-feeding malfunction

How to Identify a Genuine Clipped Planchet

Genuine clips have specific characteristics that distinguish them from post-mint damage:

• Blakesley effect — the rim directly opposite the clip is weak or missing, because metal couldn't flow properly during the upsetting mill process
• Metal flow lines — the struck design near the clip shows distortion as metal flowed toward the missing area during striking
• Consistent thickness — the edge at the clip area is the same thickness as the rest of the coin
• No tool marks — genuine clips have smooth edges from the blanking process, not rough cuts from pliers or files

What Affects Value

• Size of the clip — larger clips are scarcer and more visually dramatic
• Type of clip — straight clips and multiple clips are scarcer than single curved clips
• Denomination — clips on higher denominations carry larger premiums
• Condition and eye appeal — clean surfaces and attractive toning help

Scanning Clipped Planchets

ErrorHunt's AI scanner analyzes your coin's outline and edge characteristics to detect potential clipped planchets. Photograph the full coin so the clipped area is clearly visible.