Small floor standing unit, made to celebrate the upcoming Queen's Silver Jubilee in the UK.
The machine's dimensions were 155 x 62 x 60 cms.
I believe the idea was that if a coin entered the playfield and hit the middle section, it would dispense a 10p coin onto the playfield for the patron / punter to have the chance of winning.
Originally I think it was on 1p play. I've seen some on 2p and 10p play, with the change facility and the feature of the coin drop disabled.