Is it possible to have one side "blank"?

^^^ Can this situation happen? If so, then what is it called?

 

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OK, this comes from NGC's research director and NGC's Mint Error attributor (David Camire) - they're either struck on a "type 1 blank" or a "type 2 blank", as defined below. I don't think I've ever seen this type of error on a slab before and it may be among the most uncommon (or mis-attributed) types of errors - that's speculation of course.


First is a Type 1 Blank. It has only gone through the gang punch and will show the cut and tear marks and is "dirty" and unnealed [sic].

Second is a Type 2 Blank. Continuing on, the blank has been deburred (commonly called burnished but technically this is not correct as there is no median present), annealed, then cleaned and dried.

 

This CAN happen, but the blank sides of the finished coins will NOT be completely flat.

 

Why paddy it’s a metal lathe, some coins and superglue to glue the coin halfs together with when your done. Kinda like a magicians coin but done with a planchet? Easy to do if you have the equipment and skills. Lol.

 

A "flat die" is exactly what it sounds like. A die body that has had the face or striking surface either ground off flat, or removed to a flat surface with a lathe. It would look similar to the dies you used to see in the US Mints state quarter coin and die sets. You would use something like that if you were deliberately striking something intended to one sided such a metal decoration intending to mounted so only one side would be seen. The only such dies in use at the mint would be those used to strike decorations (small medals suspended from ribbons) for the military. Die bodies used for coins never have flat striking faces. Even before hubbing they are turned in a lathe to have a slight conical face.

 

The OP photo (not the NGC coins)
shows a machined coin.

Not an error of any normal or exotic
type......

 

If they skip the upsetting mill, I didn't think that they would fit in the collar, as the upsetting mill also reduces the diameter.

 

Wouldn't it just turn concave or flatten, sort of like how say, a cent denomination gets struck on the larger nickel planchet? Like this:

 

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If it isn't in the collar, there is nothing to control lateral pressure and yes it would spread out, but the OP's coin shows none of that.

 

I meant in general though I see that you answered that question ^^^.

But, I finally found an example!

Here is a coin that was struck off-center and on a type 1 blank.

Since it doesn't fit within the collar, the blank must have shifted and caused it to go off-center (?). I'm guessing if it was a larger blank like that of a nickel blank, then the coin would look very splayed out. Apparently it's very rare and only 3 examples of this error on zinc cents are known to exist.



This may be another one, though it looks to be scraps from the sheet that blanks were punched out of: