http://cgi.ebay.ca/small-coin-gold-...7?pt=LH_DefaultDomain_210&hash=item35accf2d05 description is mini gold dollar weight of .8 grams. it looks like a peace dollar to me, and someone in wikianswers says: If you have a very small (14 mm diameter) coin with a picture of President Ulysses S. Grant, it's a commemorative issued that year only. It comes in two varieties but both are worth roughly the same. As of 03/2009 Numismedia lists retail values of around $1000 in moderately worn condition up to $1600-plus for an uncirculated coin. If you have a large (38 mm diameter) coin with Miss Liberty on the front and the word PEACE on the back, your coin is actually a circulation-strike silver dollar that was plated for use in jewelry or similar. Unfortunately, being plated makes it a damaged coin worth only the underlying silver content, maybe $10 or so at current prices. this one doesnt sound like either of those. too light to be a peace (they were 0.859389 oz(troy) right?) this one is 0.025720 oz(troy).
Looks like a mini-Token designed to look like a Peace Dollar. It's neither of the two coins you mentioned. In fact, it's not a coin at all.
Here's 60 of them for $17 + a bottle of gold flakes. Frankly 99% of these that are on ebay are junk. They are struck in white metal, gold plated, and really not "worth" anything. They are commonly referred to as "Mini Gold Coins", they aren't gold, they aren't coins, they are just mini. There are Peace, Walker, St Gaudens, Kennedy, Mercury, and Indian Head versions that I know of, probably many more. They are a trinket or curiousity, just like the "Nixon Coins" or shrinking money. No specific purpose, they are just everywhere, and for no good reason that I've found. Gold Mini: http://cgi.ebay.ca/60-1922-MINI-PEA...86?pt=Coins_US_Individual&hash=item56400c63e6 Nixon Coins: http://cgi.ebay.com/LITTLE-GAS-MONE...61?pt=Coins_US_Individual&hash=item35ac8631fd
