Roosevelt Dime - What Have We Here!

This was given as change in a convenience store. Conveniently, the store clerk new nothing about numismatics. I am unable to imagine what caused this and look forward to learning what may have happened. The coin weighs 1.95 grams compared with the norm of 2.28 grams. It is 40 thousandths of an inch thick at the rim and 43 thousandths to the top of the button like center. A normal Dime measured 50 thousandths. Because the coin's reverse was cleanly struck with full and crisp devices as well as the presence of an even, well formed rim, I don't presume the planchet was thin when it was first struck; I may be wrong about that. I am particularly curios about the center of the obverse where it looks like a button. I appreciate all of the help I can get to learn about the error(s) that produced this example. Thanks.