I have not seen another matchbook that is "good for a free drink". Opened in 1966, this is matchcover may be a year or two later as there is another Riverside frontstrike in Mark's guide that states "70 slot machines" as you see they are moving up to a 100! I have 12 other covers from there and the go up from 500, 1000, 1500, with the latest one at 1700 slots! Its neat to see the development of these properties through the years via the matchcovers. Eric