Malaysia Parliament House 1979 10 Cents Coin With Curved Clip Error.

I bidded this Brilliant Uncirculated (BU) Malaysia first series, the Parliament House series 10 cents coin dated 1979 with Curved Clip Error. It cost me not more then RM300 to acquire it from the Malacca Auction 3 held at Malacca on the 8th of June 2014.

This is a nice BU example with a large curved clip at about 2:00 o'clock (Reverse).The "Blakesley Effect," is clearly present opposite (7:00 o'clock ) the clip and authenticates them as genuine. Another indicator of the coin's authenticity is evidenced by the metal-flow-lines on the rim meeting to the clip.It almost appears as it is moving in the direction of the clip. The "flow" is caused by the absence of metal in that area of the blank and zero contact with the collar to restrain metal flow. As a result the designs in the proximity of the clip are not fully formed as metal flowed outward toward the rim rather fully into the design cavities of the die

Many curved clips are faked by punching the curved clip out with a common punch found in almost any die shop or through other cruder methods. Collectors should take time to learn the diagnostics of this class of error even more than some of the other error types due to the ease and frequency in which they are faked.

No matter what class of clip is involved, in many cases, the rim opposite the clip will be flat and poorly formed. This effect is known within the hobby as the "Blakesley effect" and occurs due to the absence of pressure in that area during the upset (or rimming) process.
Blakesley effect

Normally the blank rotates through the mill which becomes increasingly tighter on the opposing sides of the blank as it progresses through. This creates the pressure necessary to upset the rim. When the blank rotates to the area of the clip the pressure is released and the rim fails to be formed in the area opposite the clip.

However, the "Blakesley effect" does not always appear on the struck coin; most probably due to a heavy strike, and collectors must learn to recognize other diagnostics of a genuine clip.

Look for tapering at the edge (especially at the extreme opposite edges or lips of the clip where it meets the raised rim) and notice how the metal flows and design details close to the edge stretch or elongate. Not all of these effects always occur and sometimes they are minimal but one or more of these diagnostics will generally be present on a genuine clip.
Reference:Ken Potter NLG.


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