"Austin, Stephen P SWF" wrote:
>
> Not as large as you have described - but on farm sites we find smaller
> pieces of ceramics (with legible marks and parts of pictures) which end up
> as gizzard stones in chickens and other birds.
>

Most of the ceramic "gaming pieces" I have seen fit the gizzard stone
category. And 25 mm is actually about the right size.
--
Dan Mouer
http://saturn.vcu.edu/~dmouer/homepage.htm