1986 D Penny 1 1

[Stephcronic]

What the heck is this made of? It’s really lite. 

[Greenstang]

What is really light? Give us a weight to two decimal points.   
Looks like a zinc cent that is missing the copper.

[VKurtB]

It’s made of zinc.

 

[Mike Meenderink]

These coins are zinc planchets plated in copper. The process of copper plating these coins is corrosive and sometimes results in a small amount of zinc being dissolved into the plating bath as the copper is being applied. Some zinc is then combined with the copper and plated onto the coin. This will give the coin a silvery goldish tone. Some coins may have a thin cladding layer due to improper manufacturing. Other coins may have been experimented on with corrosive acids that removed or damaged the copper clad layer. You must have the coin professionally examined to determine its authenticity, type of error and value. 

Edited March 29 by Mike Meenderink

[VKurtB]

Not an error. Occam’s razor. Messed with. 

[Mike Meenderink]

Diagnostics of Fake and Genuine Unplated Zinc Cents

 

 

by Jason Cuvelier

While searching bank rolls, one can find three common types of altered un plated Lincoln’s. The first two types having the plating removed: a Lincoln soaked in a corrosive; a Lincoln subjected to some type of reverse electrolysis; the last is when a Lincoln has been plated on top of the original copper plating. Following are some shots of various altered or fake un plated Lincoln cents that had the plating removed along with photos of genuine examples.

Partial un plated Lincoln cent. Genuine 1995 (left) and the plating removed by electrolysis is 1995 (right). Black arrows show the different sheen observed to the surfaces. White arrows show the damaged surface of the un plated area. It exhibits linear valleys and small raised islands topped with copper. The reverse shows more extensive damage. The top white arrow is an existing plating blister that somehow remained. Surface characteristics of the coin on the right suggest the process of plating removal leaves evidence of the original plating issues such as split plating, areas of thinner plating and blisters. The three lower white arrows show the damaged surface of the un plated area.

 

This 2004 Lincoln was fully un plated by a chemical corrosive. It exhibits acid bite marks and a severe loss of detail. This particular example seems to have had the sides sanded and polished down.

 

1994 1c (left) un plated by reverse electrolysis. A more significant loss of zinc and details, but not as great as the corrosive damaged 2004 example. A few small areas of copper remain in the raised portions of outside devices.

1984 1c (right) with no evidence of the plating being stripped or the zinc being damaged. No copper islands or valleys of missing zinc exist. The coin still has a nice sheen and is underweight (2.43g). Keys areas show die flow lines.

Comparison; left stack is genuine. Middle stack is altered by electrolysis. Right stack is altered by acid.