Scalextric. I loved it! Especially when the cat would join in, he learnt that instead of chasing the cars around the track, it was easier to just lay at the side and bat them off. My favourite car was the 4 1/2 litre Bentley. I have wanted one of those ever since.
Whenever I watch Flog it! or something similar and someone brings a Scalextric in for valuation I feel very tempted to empty the piggy bank and buy one.
I don't think this one counts as a toy, but I still have my stamp album that I swopped for my birds egg collection in 1965. In 1966 I joined a trip of school friends to go to the stamp exhibition in London. England had just won the World cup and it would be on display at the exhibition! WOW! Stamps AND the World cup, it don't get no better. Some ratbag stole the World cup before we got there. Just an empty display case.