1964 1 Cent Indent Strike Question

From a mechanical point of view, squashed denticles from the host coin could not be indented/incuse; they would be flattened.

I've looked at your pictures many times and I still don't know, interesting coin.

My first impression, uninformed as it may be, is that it's a small incomplete clip (or whatever that's called) and what you see is a result of striking the odd planchet. I have trouble perceiving the denticles as indented from these images. It looks dovetailed like a clip would be. I can talk myself into seeing a small Blakesley effect on the portrait side opposite the defect, but it could be that the rim is abraded in that area.

Here are the 3 possible types of aligned partial brockages according to error-ref. Number one is most common and most likely due to the rim fim that is present.



1. Brockage from an off-center (partial) die cap. This is the most common cause. A planchet is fed into the striking chamber in an off-center position. It is struck by the dies on both faces and then sticks to one of the dies (usually the upper or hammer die). Another planchet is fed into the striking chamber and the partial die cap is struck into it. The result is an incuse, mirror-image version of the design that is aligned with the die-struck design on the opposite face. These types of aligned partial brockages generally lack an impression of the design rim. When struck in-collar, metal often flows over the top of the collar to form a horizontal lip

2. Brockage from an elliptical clip coin. An oval planchet (an elliptical clip) enters the striking chamber and settles against the collar. It is struck by the dies on both faces and then sticks to one of the dies (again, usually the hammer die). Another planchet is fed into the striking chamber and the elliptical coin is struck into it. Once again you end up with an incuse mirror-image version of the design that is aligned with the die-struck design on the opposite face. This type of aligned partial brockage will usually show an impression of the design rim and will lack horizontal lipping.

3. Brockage from an elliptical strike clip. A planchet is fed into the striking chamber in an off-center position. During the strike it is sheared in two between the hammer die and a collar that is frozen in the "up" position. The oval remnant of the coin within the striking chamber then sticks to one of the dies (usually the hammer die) and is struck into the next planchet. This type of aligned partial brockage may show an abnormally broad "rim" impression, which actually represents an impression of the rounded shoulder that often forms on the face struck by the anvil die. Horizontal lipping is generally absent.

SPP...It seems round...here are some new pics.





Thanks for everyone's comments so far!

Partial brockage of what, exactly?

Do you not find it odd, that the "brockage" design elements line up perfectly with what the design would be on a normally struck coin?

Secondly, the 'brockage' rim thickness is twice as large, but the denticles are not enlarged.

Lastly, the depth of the indent is very shallow; much less than any strike-through clip element I have seen on 1-cent coins.

As much as I respect Mike's research and work, I don't find his interpretation plausible with this coin.

You would have an easier time convincing me it was double struck, with the second strike through an overlapping thin planchet, or a die cap fragment.

Yes! That is why I bought it. I couldn't see anything else that pointed to it being PMD. I like good mystery, don't you?

Would you like to examine it in hand?