Hi Madmelons,
If your machine as a sticker from Service Games, it was supplied or even operated in Nevada by one of the Service Games companies Service Games (Nevada) Inc, who in turn was the Official Mills-Bell-O-Matic distributor for Nevada, in 1958 they was also owned Service Games (Japan) Inc, Contrary to many people saying that Marty Bromley founder of Sega copied the Mills machines in Japan, that is not true, when the Johnson Act took effect banning the interstate shipping of Gambling machines, Marty bought a set of tooling from Mills and later closed a deal with Tony Mills to supply and distribute all Mills Bell-O-Matics machines and parts, these parts were made in Japan and assembled in Nevada by Service Games (Nevada) Inc under the direction of Korwin Hailey who was the President of that company, Service Games had a large coin machine route throughout Nevada, the four reel Crown model was an effort to compete with the Jennings Buckaroo model.
The one English 6p model shown in this discussion was supplied by Las Vegas Coin Ltd, a company in Poland Street, London, set up by my old associate David "GabE" Forman who was the official British Distributor for the Mills Bell-O-Matic Company in the late 1950's.