The change in 1np coins has perplexed anyone with a post decimal or decimal converted machine.
The steel content falls foul of coin ejectors with magnets, and the increased thickness stops any comparator devices.
I remember reading 1972 somewhere, but now I can't verify. Does anyone know for sure? Seems odd considering it wasn't that long ago compared to some machines we all collect.
with American pinball you can often trace dates to manufacturer press releases and ads in trade magazines. Does the UK have their own we could verify in?
1972 sounds right, but I've never seen anything definitive like a dated flyer, and there wasn't a patent as it was essentially a copy of much earlier games. The requisite 1p coin was available from 15 February 1971 when we went fully decimal. Bell Fruit seem to have churned out a lot over a short period, but it was a bit of a side line to their gaming machine activity.