Quoted from docscott:There used to be "No Gambling" signs posted on some machines in some states.
They also used to come that way from the factory in the 50s:
The tray liner on my 1954 Gottlieb Stage Coach has a graphic that says "No Prizes No Wagering".
Other early 50s Gottlieb's had one that read "Minors Not Permitted To Play This Game".