Double Die or Strike Doubling

Jeb

I am going through about 2500 wheat cents that I acquired and I just found this 1940 S. Your thoughts as to strike doubling or double die.





Thank you.

lasvegasteddy

<<< in the strike doubling crowd

CaptHenway

Definitely strike doubling, because back they they added the mint mark after the die was hubbed, so a doubled die would not have a matching doubled mint mark.

TommyType

<< <i><<< in the strike doubling crowd >>



Agreed.

And someone will correct me if I'm wrong....

But I think at the time, the mintmark was not a part of the hub, but was added after the dies were made. Therefore, if you see doubling on both the design, and the mintmark, you can be fairly certain it is strike doubling?

(It's an old memory, so I may be setting myself up to be smacked on this one. )


Added: I type too slow. Confirmation of my memory above my actual post.

lasvegasteddy

<< <i>Definitely strike doubling, because back they they added the mint mark after the die was hubbed, so a doubled die would not have a matching doubled mint mark. >>



stored in my learn something new today file

thanks capt'n for sharing that tidbit....makes perfect sense too

FredWeinberg

Nice close-ups of what's called various names:

Mechanical Doubling
Strike Doubling
Ejection Doubling
Shelf Doubling

Notice the the 'doubled elements'
are flatter than the normal digits,
and there is no separation of the
numbers or letters.

I use the '55 Doubled Die as an example
of what even a much more minor doubled die
should look like - the thickness and height of
all of the doubled portions of the coin are exactly
the same - not flatter, wider, etc.

Jeb

Thank you everyone for the information and the lesson.

keyman64

<< <i>Nice close-ups of what's called various names:

Mechanical Doubling
Strike Doubling
Ejection Doubling
Shelf Doubling

Notice the the 'doubled elements'
are flatter than the normal digits,
and there is no separation of the
numbers or letters.

I use the '55 Doubled Die as an example
of what even a much more minor doubled die
should look like - the thickness and height of
all of the doubled portions of the coin are exactly
the same - not flatter, wider, etc. >>

Don't forget Machine Doubling.

rmpsrpms

Nowadays it is called MDD, Machine Damage Doubling.

segoja

This board seems to have the right answers for these type of errors

Unfortunately for the OP this coin has little value

tahoe98

<< <i>Nowadays it is called MDD, Machine Damage Doubling. >>



...and for a lot of us a real blood pressure raiser when first spotted...

coppercoins

Problem is that MDD also stands for Master Die Doubling...something completely different.

Each of the different "names" above fit within "machine doubling" and represent different manifestations of non-collectible doubling caused by a malfunction in the striking process.

ricko

I agree....machine doubling..but interesting and worth keeping as a teaching tool...Cheers, RickO

winky

I believe we just need some more double things. They look good but are worthless.