2000p Roosevelt dime weight

I found a 2000 p Roosevelt dime with a 2.1 g weight. Is this common? It has a grove in the reed all the way around. I am a newbie so I have to check everything. Hope you can help.

 

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This should answer everything for you: http://en.wikipedia.org/wiki/Dime_(United_States_coin)

 

Link goes to a page with nothing on it.

The groove all the way around on the edge is the key clue here. It has had an extended soak in a weak acid that has dissolved away some of the metal of the coin and it has attacked the copper more strongly than the coppernickel. Hence the groove.

 

misplaced bracket in URL, should work now.

 

The dime is a MS-60. If it had been in acid wouldn't there be flatening of all the images?

 

I have read this and some other information on coin weights, but thank you for taking the time to read my post.