The late Ben Kriegh documented the $28. Colorado
strikes in his "Priceguide for Colorado and Deadwood Tokens" which he put out in 1999. According to his informaton, there are 11 variaties of the generics. There are two from Colorado Central Station and one from the Teller House. The generics consists of an eagle on one side and a miner on the other with the same varieties that you would find on the $7. American Wildlife Series. It's a little confusing and would probably be easier for me to e-mail you a copy of the listings, if you are interested. Ben had most of them valued at $35. They haven't sold for much more than that if I remember correct but I just woke up from a nap and my coffee hasn't kicked in yet. I'll try to email you more information when I get woke up.