It is as mentioned already, Machine Doubling
. This is very common to see on the 1968-1972 cents. Note how to tell that this is Machine Doubling
1. Note the devices are affected on the outside/inside areas of the devices.
2. Nothing is enlarged showing a spread on the devices. The contour on those areas are what was removed on those affected devices.
3. you can see the die movement post strike of the devices on the obverse is a push south on the devices. (Chances are they are in the opposite direction on the reverse of the coin) Pushed from the bottom of the devices towards the top. Just a post striking event on these coins. A doubled die will show spread/an enlargement of the devices.
And the Machine Doubling
can happen on a DDO
This happens post strike. Note on these, you can see the DDO
on the date, but not on the mintmark? Note the yellow arrows on that area of the design. Note they are pointing towards the MD. (Note that all the mintmarks are affected in the same direction as the rest of the MD on each coin. A doubled die can have Machine Doubling
, but Machine Doubling
never creates a doubled die. Only a doubled die, can strike a doubled die. The dies that struck your coin are normal dies, so it can't create a doubled die
Note on this coin the Machine Doubling
is all in the same direction. There can be a swing on Machine Doubling
if the machine is really loose. But MD is always caused by a loose machine.