This is my Curved clip Quarter . It's a Contest prize marked as BU curved clip 10% . I just don't know how they got that ?
It's called an Incomplete Planchet. Technically they are not really clipped. Here is some information - http://www.error-ref.com/_curved_clips_/ Quote - "Definition: A curved clip is generated when a punch (blanking die) overlaps a previously-punched hole in the coin metal strip. The resulting blank ends up with a concave deficit. It is believed that a failure for the coin metal strip to advance properly through the blanking press is the root cause of this planchet error." Closed quote
This is the first time that I've seen a clip measured as a % of the whole. I've seen this used for Off-Center errors, but not clips. Has anyone ever seen a clip larger than 50%? ~ Chris
One way to get a reasonable estimate is to measure the length of the coin from the opposite rim to the edge of the clip (Vernier calipers work well). Since coins are struck in a collar, the standard diameter is consistent, so you can look it up (or measure it yourself). Quarters are 24.26 mm in diameter [(24.26 - length of clipped area remaining)/26.26]x100 = Percentage Clipped. It isn't exact but since clips are usually reported in increments of 5%, you don't need to worry if it's a 9.21% or 11.63% clip. 10% is good enough
