- I've posted in the "defective and damaged planchets" album some
pictures of a 1986 zinc cent with pre-strike damage. I received it a
short time ago. In some places it looks like the copper plating was
scraped off prior to the strike. In other areas it looks like molten
zinc splashed onto the planchet before the strike. The weight of the
coin falls within the normal range of variation (2.52g).
The vast majority of partial plating errors are due to the plating
having never been deposited at all. Only a small percentage are due
to pre-strike damage, and a similar small percentage to peeling off
after the strike.
- Here is a real nice example of pre-strike damage to a copper-plated
It's too bad that so few people collect this error category. I find
them very interesting as they're so diverse in cause and appearance.
Pre-strike damage is completely different from irregular planchets or
incomplete planchets. In pre-strike damage, the blank emerges normal
and intact from the blanking press and then is chewed up before or
after its passage through the upset mill. With irregular planchets
and incomplete planchets (i.e. "clips") the blank is abnormal from
the start due to improper blanking or a defect in the coin metal