What do you call this mint mark phenomenon?

georgiacop50

Just machine doubling or??

cmerlo1

Machine doubling.

ricko

Looks like Triple D.... Diners, Drive-in's and Dives..... Cheers, RickO

FredWeinberg

Classic example of 'shelf' doubling.

Notice how the other 'D''s are FLATTER
than the smaller, original, main D mintmark?

If it were a RPM or DDR, the D's wold be the
exact same thickness and height off the suface
of the coin - not wider and flatter.

aka: 'ejection' or 'mechanical' doubling.

CaptHenway

I use the term “machine doubling” as Ed Fleischmann taught me. Other terms such as Fred’d Are equally valid.

AUandAG

If you are describing how it looks it's "shelf" doubling. If you are describing how it happened it's "mechanical" or "ejection" doubling.

bob.

Looks like shelf to my eyes.

Insider2

Let's see how long we can keep this discussion at the top of the first page by continuing to post the same thing as the first answers by @cmerlo 1 and Fred.

cameonut2011

@Insider2 said:
Let's see how long we can keep this discussion at the top of the first page by continuing to post the same thing as the first answers by @cmerlo 1 and Fred.

For good measure: I agree with machine doubling.

Insider2

Anyone ever hear the old term "Strike Doubled?"

RogerB

RE: "Classic example of 'shelf' doubling."

Yep. This happens when the coins are put on the very tip, top shelf at the Denver Mint. The high altitude and thin atmosphere make mintmarks dizzy and they sometimes wander a little. Nothing to worry about. Take the coin to some place like Death Valley, CA where it is below sea level and it will slowly recover.

(Of course, with the sea level rising, you could choose more places to be "below sea level.")

BuffaloIronTail

@Insider2 said:
Anyone ever hear the old term "Strike Doubled?"

Iv'e heard of "Strike Three and Your Out" doubling.

Pete