There is another Dunes 20 strike, the one that promoted their silver token sale in 1976 (or was it 1776?). Here's what it looked like, and a scan of what I think they were selling then. Not a SilverStrike, but one of the early pure silver tokens made to be collected. The reverse has the eagle design shown on the cover of the match.

Pretty scarce; you can see what I paid for the match 10-15 years ago .

I have no other Dunes $25 tokens, so they may not have had $25 slot machines and this may be a souvenir item.