Hey Robert, The Harrah's experimental machines were in some ways very similar to the Bally model 873 in your picture. But Bill Harrah did not like Bally that's why he developed these machines. Me and my partner bought all these machines from Lou Binetti at Nevada Novelty in around 1993. We drafted up this flyer to help promote and sell the machines. I got to know Bill Harrah around 1972. I remember some nights sitting around with him and Harvey Gross, and Sharkey drinking and smoking cigars at Harvery's Top of the Wheel across the street from Harrah's. Those 3 were some real characters with some great stories.