Check your 1998 Silver American Eagles!!

[Silver Rocket Bitches!]

Some were struck on .900 planchets.

http://www.coinworld.com/articles/american-eagle-struck-on-900-fine-planchet

[mamboni]

Lacks reeding and is light by 4 grams - should be easy to spot. I wish I had one!

[madfranks]

I have never heard of a commemorative silver dollar without the reeded edge, so this is also news to me. I thought all silver dollars had reeded edges.