1990 Penny US Silver Looking

and

Without pictures it's hard to say what you have

at the top of the thread click on "reply to topic" that's where all the little icons are.Click on the green camera that says upload image. Browse for your picture and just follow the directions.Hope that helps

I hate to say it but it looks copper to me. If there's no MM it was minted in Philadelphia mint.Maybe someone else can see more than I'm seeing

Perhaps electro nickel plated in a school laboratory.

Here's a short video of how to plate a cent.This is only one way to do it, there are several more ways to do it.By the way have you weighed it?
http://www.youtube.com/watch?v=_g_ml8tAnWE

There are a number of ways a plated Lincoln Cent can be altered to look like it was a different metal. The plating can be stripped. The plated coin be re-plated with any number of white metals. The pictures are too small for me to make any kind of definitive guess.

The coin needs to be weighed, in grams, out three decimal places. Where the coin was obtained doesn't really mean anything unless it came from a US Mint set.

A genuine Lincoln Cent struck on a unplated planchet can be $100-200. It has to be seen by someone to authenticate it. Weinberg thinks these are as rare as a Lincoln struck on a dime planchet. I just wrote an article in chemically stripped Lincoln cents in the recent CONECA ErrorScope.