Another question?

MadMarty

While looking through the $1500 in halves, I came across 2 strange halves. The first thing I go when I pull a handful out of the bag is look for halves without copper. When i pulled these 2 the reeding is all silver, but they are a 1974 and 1971 Kennedy. At first I thought they might be on a foreign planchet. But now I'm wondering if they have been silver plated. It there anyway to tell?

Rampage

I would weigh it and if that does not help any, then ask Mike Byers. He may be able to help from the scans, but may need to see them in person. Richard.

nwcs

Specific gravity test and weighing are the best ways. If you have a very fine measuring device (most of us don't) you can see if the thickness is beyond mind tolerances. You can also look for defects on the coin surface and see if they look "filled" by a plating (as in post-damage plating) or if the damage revealed the true surface of the coin..

Conder101

Specific gravity probably won't tell you much on these unless it is a foreign planchet of some oddball alloy. The specific gravity of copper, nickel, and copper-nickel alloys are all pretty much identical out to two decimal places. To get better than that and get consistant results takes special care and conditions, good lab technique and equipment. Silver plating on the coin won't affect the SG enough to be detectable. A good metal detector with descrimiator circuits might help by giving you a reading of the electromagnetic signature.