Jim- here is a link to it-
http://www.so-calleddollars.com/Eve...tennial.htmlgraceoutcast- here is the criteria as set by Hibler and Kappen in their 1963 book "So-Called Dollars"
This present work is restricted to medals of an exposition, commemorative, monetary and kindred nature. ...From the beginning, however, it was necessary to establish the following specific limitations in order to contain our efforts within a manageable perimeter:
1. United States only.
2. Minimum diameter - Size 21 (1-5/16 inch or 33mm).
3. Maximum diameter - Size 28 (1-3/4 inch or 45mm); but silver Bryan Dollars are listed.
4. No holed or looped material unless struck plain also. Our Nos. 1 through 3 are the sole exceptions.
5. No plastic, fiber or similar material unless issued also in one or more metals.
6. No purely presidential or political medals.
7. No school, college or athletic medals; no coin club or U.S. Armed Forces medals.
8. No calender or store cards; no trade tokens or emergency money.
Take a look at this link
http://www.so-calleddollars.com/ and you might get a better idea of the variety of medals that are known as so-called dollars.
chrycopaul- the name "so-called dollar" is anything but a marketing gimmick. Some people collect transportation tokens (vecturists), some people collect political medals, and so-called dollars would fall into the category of historical medals with some guidelines as to define them.