I was lucky to get an early start on ivory chips. Here are the four different Justice Ladys. Most likely the natural color was used for a $1, the red for a $5 and the butterscotch was a $25 or $50 with the black a $100. Yes that would be a $100 chip from the 1800's. Very few collectors have the four piece set. On the two links below there are pictures of the four different colors of the eagles. The red and brown are shown in a cool belt buckle. To my lnowledge the blue eagle is buy far the rarest of the eagles.

http://www.napanet.net/~sellnapa/ivoryb.jpg
http://www.napanet.net/~sellnapa/ivory2e.jpg

The pictures load slowly but I think they are worth it.