Do You Like Mechanical Double And Why?

the way I heard what happens is when the coin release from the die it jump up and hits the other die in the same places hard enough to leave a impression

I really have no opinion one way or the other. It is just part of the process that occurs like ejection doubling. The really drastic examples do get your heart going, though, until you look at it a little closer. So, from an adrenaline rush stand point, I guess I kind of like them.

Jim

And, no they have zero extra value to me. I already have a box full of them.

i have one graded by anacs no doubling on the coin!i keep it as a joke to myseif on what to look for.

Machine Doubling is damage done to the coin when the die bounces. It's basically a double hit on the coin by the die. This is generally caused by loose dies. It is coin damage, and it is not worth a premium.

Machine Doubling and Strike Doubling are the same thing...and neither are EVER called ' Mechanical Doubling' - that's simply not a term.

Eject doubling is very similar, is also a form of Machine Doubling, is very common, and is also not worth a premium value.

Basically any form of 'doubling' that is not caused by doubled devices on the die is worthless to most collectors. There is no market for it, thus it is considered non-collectible. You can collect it if you want, like it if you want, but the fact is that there's no value in it.

To try to make this as simple as possible since the explanation can be a book:-)

Machine Doubling is damage that happens as a coin is struck that distorts the letters into something that looks to the untrained eye like doubling.

Die doubling is doubling of lettering and details on a coin that is the result of doubling that is actually already on the die itself.

Machine Doubling is flat and shelflike, Die doubling shows separation between the images.

I am switching from one internet server to another so one of my pages may not be available. In any case, I have an article on doubled dies on Kennedy half dollars at http://www.askaboutcoins.com

Click to open the article. Click on the link under the picture to open it up then place your mouse over the picture and click again to enlarge it. It will show you what to look for on Kennedy Doubled dies. You will see the separation I am talking about, particularly on the 1969 D DDR and the 1974 D DDO.

Thanks,
Bill

PS: Ask About Coins is not loading right now.. Keep trying until you can get there. It may not be available tonight.

Just my ebay experience: I get/got about 8x - 12x face value on rolls of error cents that included chips (e.g. LIB) and MDs. I dont know how that would play out with single halves. There's a Franklin half with MD on ebay, starting bid, .99. There's a 1983-P Kennedy with reverse doubliing, Buy it Now for $29.99 and a 1976-P Kennedy with reverse doubling (buy it now) for $79.95.

And every one of these is a case of misrepresentation by people who don't know what they are looking at, and buyers who don't know what they are looking at. The blind leading the blind.

coppercoins said, "And every one of these is a case of misrepresentation by people who don't know what they are looking at, and buyers who don't know what they are looking at. The blind leading the blind."

That is true to a large extent, copper. However, there are people who are interested in these types of errors. When I list my error cent rolls, I list each date, mint, and type of error. Some people just like errors. Heck, I got nearly 6x face on rolls of "toned" coins. I dont imply there's some fantastic added value to errors.

I understand the sellers of the halves I referred to probably do.

As an aside, I'm not a huge fan of most RPMs (except for the likes of horiz/verts, etc)...their only added value to me is the demand for them by others.