Collecting my Thoughts: Understanding Machine Doubling Damage

machine doubling price ( MDD ) has been a topic that I have researched and written about for close to 30 years. curiously it is a subject that has been about impossible to “ sell ” to the collectors and dealers. Since it affects global coins, it will be this week ‘s topic. Anyone who has looked close at a quantity of coins has seen it. It ‘s the most common form of doubling found on coins. It has appeared under a laundry list of names, such as “ shift, ” “ micro-doubling, ” “ double die, ” ( not doubled die ), “ strike double ” and most recently as MDD. I have to take the blame for the “ strike doubling ” title, which I based on some fake information given me by a Mint official. It is not part of the hit, occurring after the completion of the strike, therefore obviously it can not be strike doubling. The actual cause is the bounce of the die/die holder assembly on the strike coin. The strike ends with the “ final examination impingement of the die pair. ” Die leap or chatter involves only one die. While you can find MDD on both sides of a mint, the causal agent is different on each side as there are at least three forms of MDD, each with a different campaign. When I had to ‘eat ‘ the hit doubling label, I picked up the MDD name, which was being used by the previous ANACS when it was hush depart of the ANA. From the identical first, attempts were made to claim that doubling was caused by the fail twisting at the moment of impact. A little think will discount that theory, because you are dealing with a die which is meshing with the forming design on the coin under 25 or more tons per square edge of press. The come of pull needed to rotate the die under those conditions would run into the thousands of tons. If such a wedge were available, it would shove the entire design out of position. MDD always affects only character of the design, so this can not be the cause. To prove my point, hold your hands together, with your fingers interlaced. now, test and move one hand sideways without moving the other.

The evidence is very clear that MDD occurs after the fall. The mint design is accomplished, meaning the die couple has done its job. The bouncing/chattering die moves metal that has already been formed. Struck alloy has a different appearance than the alloy shoved or moved by the bounce fail. Because of this difference it is possible to trace anything that occurs during the mint process. Anything that happens after the strike can not be traced as to clock time or station. Over the years many attempts have been made to sell coins with MDD for substantial prices. Checking the back issues of the avocation publications will turn up prices a high as $ 75 for a coin with MDD ( but hiding behind some nickname ). The fact that MDD is damage to the strike coin and reduces the collector respect rather than increasing it is a acerb pill to swallow, specially among collectors of some of the early coins where such duplicate has been hailed as a collectible for years. Chalk it up to the miss of cognition of the mint procedure. Alan Herbert retired as editor of Coins Magazine in 1994. He is now a conducive editor program for Coins and three early Krause Publications periodicals. Known throughout the Internet as “ Answerman, ” Herbert writes four question-and-answer column in the KP numismatic magazines and newspapers, a job he started in 1968.dfdfaffdsaf

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