Paul,
Does the Stagecoach have just a $1 sign on the back? If so, I think it's the same one Greg has a picture of on his Nevada Ones site, with a notation that it was in use in the poker room on 1-30-09.

Here's a link to Nevada Ones
http://www.chipguide.com/cgi-bin/search/search.cgi?id=nevones