1961 Jefferson......from a roll "Alloy Error"

SUMORADA · April 9, 2012 2:19AM

FredWeinberg · April 9, 2012 2:23AM

Today we call them "Sintered" or
"Mis-annealed" planchets.

In the 'old' days, they were called
'Copper Wash' coins.

It's the result of the planchet, before
it was struck, being overheated in
the annealing process - literally Sintered.

mingot · April 9, 2012 2:23AM

Sure looks like an improperly mixed alloy to me.

I've seen a few that have very obvious spots of copper, but none like this. Very very cool.

edit: but i would take the guy above me's word for it

guitarwes · April 9, 2012 2:34AM

purdy cool lookin'

OldEastside · April 9, 2012 2:43AM

I like it, very cool, was that the only one in the roll?

Steve

ricko · April 9, 2012 3:29AM

Interesting.. I have seen the sintered black Jefferson's but not these.... Cheers, RickO

19Lyds · April 9, 2012 5:46AM

Whatever the last bid was...........I'll double it!

errormaven · April 9, 2012 6:32AM

It was struck on an improperly annealed planchet. Exposure to excessive heat or prolonged heat caused the constituent metals (copper and nickel) to migrate and segregate out into relatively pure layers. Copper tends to accumulate on the surface. The terms "sintered plating" and "copper wash" should be discarded as they refer to theories that have been falsified.