Quoted:
So it has something at the top like this one?

http://www.flintski.com/10_eagle_rope_pend.jpg

Quoted:
Early poker chip?

Is the rim a separate piece, or part of the coin?  (looks like part of the coin to me)

Since it has a number '10' on it, it represented 10 somethings at one time I'd think.

Quoted:
Post it to the TreasureNet "what is it" forum.

Guarantee you will find the answer there.

http://forum.treasurenet.com/index.php/board,14.0.html

Its called a radiant eagle game counter. They're called "game counters" because they were used in much the same manner as poker chips or play money.

http://www.treasurenet.com/cgi-bin/treasure/westeast/askmarkparker.pl/Show?_id=200304&sort=DEFAULT&search=counter%20

It's been about 60 years since I found this item in northeastern Colorado, but I've never managed to find out much about it. So, any information you can offer would be welcome.

A lot of other folks have been searching for details about it, too, but to little avail. It's called a "Radiant Eagle" game counter, and over 20 varieties have been reported. Some are as small as a dime; others, a little larger than a silver dollar. Denominations include 2-1/2 ( or 250), 5, 10, 20, 50, and 1.00. They exist in brass, gilt brass, silver-gilt brass, gilt pewter, and aluminum. Some are coin-like; some have watch-stem loops, like yours. They're called "game counters" because they were used in much the same manner as poker chips or play money. When they first appeared is anybody's guess, but at least the aluminum ones can't be much over 100 years old. Value? $15-20.