A friend of mine had a NVT (Norton Villiers Triumph) moped of some description. Haven't a clue what it looked like now as it was circa 1977 & he bought it second hand.
I've got an engine in the shed called a Trojan Mini Motor, I think from the '50s, it was for converting a bicycle to a moped. Apparently had a top speed of 22mph and did 240mpg.