Doubled vs Machine Doubling

1Mike1

I've seen some coins like the 55 and 72 Lincolns that are obvious double. I have also seen some coins that have to be magnified to see a tiny difference in strike that is also called double die. But some coins on here are also called machine double. Can someone tell me what the difference in machine doubling and a slightly doubled coin is? To me some of the machine doubled coins look more like a double die than the coins that are being called double die. What's the difference between how these coins have been created?

Walkerguy21D

Others like Fred W. will have better explanations, but the short answer is the machine doubling, also called die bounce, mechanical doubling, among other things, is caused by a normal die that perhaps became a little loose, and when stamped, slips across the planchet, generating a shelf-like secondary image adjacent to the primary image. These tend to be flat and shallower than the primary image. These can indeed be dramatic - look at some of the large cents from the 1830's as prime examples.

A doubled die is caused when the die impression itself is doubled when it's created during the hubbing process (I think this is correct). The die is impressed slightly off during one of the latter impressions, creating a double image in the die. All coins subsequently struck with this die will have that doubled image, and the images will be of equal height, with no flattening of the secondary image.

DIMEMAN

@Walkerguy21D said:
Others like Fred W. will have better explanations, but the short answer is the machine doubling, also called die bounce, mechanical doubling, among other things, is caused by a normal die that perhaps became a little loose, and when stamped, slips across the planchet, generating a shelf-like secondary image adjacent to the primary image. These tend to be flat and shallower than the primary image. These can indeed be dramatic - look at some of the large cents from the 1830's as prime examples.

A doubled die is caused when the die impression itself is doubled when it's created during the hubbing process (I think this is correct). The die is impressed slightly off during one of the latter impressions, creating a double image in the die. All coins subsequently struck with this die will have that doubled image, and the images will be of equal height, with no flattening of the secondary image.

Great explanation WalkerGuy. Sometimes it is easy to tell the difference and sometimes it is harder.

ricko

@Walkerguy21D Good explanation.... Die movement = machine/ejection doubling. Hub image doubled = doubled die.... Cheers, RickO

Walkerguy21D

From my large cent hoard:

oih82w8

I found this in another forum by C.D. Daughtry

1Mike1

@oih82w8 said:
I found this in another forum by C.D. Daughtry

I like this. Very helpful.