Parking Meter Lamp - I bought one of these in the 1980s. I was told that the city of Chicago donated its old meters to the Boy Scouts club there and the teenagers retrofitted them to be lamps and sold them as a fund-raising project. Nickels or dimes "feed the meter" for up to an hour of light; when the meter runs down, the light clicks off. Quite a conversation piece. :-)
1947 Daval "Best Hand" coin-op poker machine for 1 or 2 players. Operates like a pinball machine ... insert a penny & pull lever to drop balls into card slots ... whoever has the best "hand" wins ... fun!
1920's coin op by Charles Ahrens - "The Execution" - put a quarter in and lights come on in the prison, beyond the door you can watch the prison get hanged! What a gruesome coin op!!! (I also pinned the video of it in operation.)