Possible 1994-P Jeff Nickel, Silver?

That would be a nice one. It's theoretically possible, since they started making the 90% silver proof sets in 1992, and your nickel ante-dates that. In case you didn't have the chart, I've attached the weights coins minted on planchets cut from improper stock. It might be useful when you get your scale.



[edit: I just corrected myself in my head. Silver proof sets were minted in San Francisco, so that makes a wrong stock error less likely. Near impossible? I'm just assuming they only cut the silver blanks in SF, but I don't know this for a fact.]

An alternative explanation is an internal planchet flaw that alters the pitch a dropped coin makes. I don't have any experience with this first hand, but I've seen on CRH forums where people are insistent on weighing possible silver coins instead of the "ring test" for that reason.

Good luck. I'm interested in your update.

A nickel struck on a planchet of the correct size but 90% silver would weigh about 5.79 grams. Tolerance for a copper nickel planchet would be 5.19 grams. So an accurate weight would go a LONG way to telling if you have anything special. I'm not holding my breath. Wrong side of the country for silver planchets, and the mint had stopped striking foreign coins ten years earlier. Frankly it's just a good demonstration as to why the ring test is not a dependable diagnostic tool.

Here are the measurements:
Weight: 4.98g
Diameter: 0.835" (21.209 mm)
Thickness: 0.075" (1.905 mm)

The coin is non-ferrous and fails the magnet "Silver" test.
The metal detector shows is as Nickel.

I'm at a loss. I do not think it is silver, but it seems like it is the wrong metal.
It actually sounds closer to a clad quarter than silver when compared to other coins. A quarter is .005" thinner.
I am at a loss for now but still investigating.

True enough, the sheet this coin was punched from could have been heated or tempered improperly too. Too many other things could have happened to account for this. I'll just chalk it up as strange. Thanks all....