Turkey 10 Kurus 1971 coin

The 1971 Turkish 10 Kurus coin (KM-898 ) F.A.O Issue is listed as having a bronze composition (97% Copper.2.5% Zinc, and 0.5% Tin).  Most all 10 Kurus coins that I have in my collection from 1969 to 1974 except  for one 1971 coin have the bronze coloration.  I have one 1971 in my collection that appears to have a silver coloration instead.  Is this a minting error, a victim of some sort of electrolysis, or a very cleverly designed fake?  

Hello and welcome to Numista!

Do you expect us to evaluate your coin without even seeing it?

Well, Yes!  I thought my description would be enough.  I will attempt to supply you an image by way of the drop down menu located in this messaging forum.  I will attempt to photograph them with my cell phone.  I will put a regular bronze colored 1971 issue beside it for  comparison.   Here goes…

Obverse side of 1971 10 Kurus coins                        Reverse side of 1971 Kurus coins

Looks like somebody plated it.

I agree. high school shop class exercise.