National Savings Stamps for kids to save up with. 1960's
One with an image of Princess Anne for 6d - pre decimal currency
One with an image of Prince Charles for 2s 6d
Sports mopeds - a mid to late 70's phenomenon.
In the UK the age to ride a motorcycle went up to 17 and so in the early 1970's a 16 year old could only ride a 50cc moped (a tiny motorbike with pedals so you could pedal it along too) which would reach about 30 mph tops.
So the Japanese manufacturers and some European ones like Gilera Garelli KTM "sooped up" these bikes and gave them gears and a top speed of about 50 - 60 mph.