1965 "Thin" Penny?

It may have been struck on a defective or incorrect planchet. Can you post any pics?

Simply out of curiousity, does anyone here collect thin cents?

There are a number of different causes for a 'thin' cent, and not all of them are mint errors. Without having more detail about the coin or images of the coin it is impossible to determine which it is.

One common post-mint procedure back in the day was to sit cents in acid long enough to thin them down to the thickness of a dime, then grind away the circumference of the coin until it would pass in vending machines as a dime. Many of these still exist out there, both failed and successful attempts. These are generally readily identified by softness of detail and a pronounced 'acid etched' appearance.

The most common mint errors include planchets that were laminated then split before or after the strike, and wrong stock errors. Once in a great while a roll of stock meant for dimes would make it into the blanking machine before being clad and would be cut into cent blanks. This is quite a bit less common than the typical lamination. Either way, certification would be a must, and value, if not uncirculated, would probably be less than the cost of certification.

Please weigh the coin using a gram scale, then acquire good images of both the obverse and reverse of the coin if you'd like further assistance. Without this information any progress in its identification would be impossible.