Mercury 1945 Double Die Obv?

Yeah, its Mechanical Doubling, very common and not worth a premium

What is the difference between doubling and Machine Doubling?

arthrene - Hub doubling, or doubled dies are where the actual design on the die has doubling in it, usually caused by a glitch in the hubbing process that creates the die. These are supposed to be caught and destroyed, but obviously are not always caught and end up making coins. All of the coins minted with the doubled die turn out with the same doubling on them, so each coin can be identified as to which die created them.

Machine Doubling is simply a loose die or other mechanical part in the striking process. It is flattened down, looks like it was scooted into place, is very common, and is not considered collectible.

cearnan - Just because one person here and there unscrupulously passes off a machine doubled coin for good money, or just because an unknowledged collector buys one doesn't mean they have value. It means that someone made a mistake and paid too much for a common coin thinking it was worth something. The fewer people who offer these common forms of non-collectible doubling up for sale the fewer novice collectors get taken for a ride. A lot of times when a beginner collector takes a bath on a coin because they didn't understand something, they lose interest in collecting...and I don't like to see people lose interest, especially when someone sells a coin knowing it isn't anything special and makes good money on it out of other people's ignorance.

Hmmm...I wouldn't assume that all people who bid on a machine doubled mercury are clueless. Believe it or not, some people find more dramatic examples of Machine Doubling interesting and even collectible. Either way, it is like anything else in life, if you don't do the research to understand what you are buying, then you are going to get ripped off at some point. Most of us have.

Coppercoins- I think you misunderstand my intention. I assume that the bidders had some idea of what they were buying and still chose to buy the coin. I do not advocate the selling of something under false descriptions. Also, it is possible that the person selling the coin really did think that they had something.

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just because an unknowledged collector buys one doesn't mean they have value. It means that someone made a mistake and paid too much for a common coin thinking it was worth something.

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For the most part, it just means that it has no value to you. Why do people spend so much on modern coins that are minted in the 100's of millions? It is because these people value it at the price they pay. I would never pay for a modern high mintage coin, but that is just my preference, and shouldn't be imposed on other buyers. Look at the bidders, there wasn't just one person who valued the merc highly.

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I agree wholeheartedly with coppercoins. The purpose of this forum is to educate people so that they will not buy worthless coins for good money and also to prevent people from selling worthless coins as collectible. Obviously, I could never condone someone encouraging another member on this forum to sell a coin dishonestly!

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You misunderstand my intentions as well. Once again, I make the assumption that the bidders of the merc knew what they were buying and it was most likely a misclassification made by the seller.

I see nothing wrong with offering a machine-doubled dime for sale, as long as the listing includes a complete and accurate description. The sellers that deliberately mislead potential buyers are the ones that are destructive to the hobby.