This machine was a moped / scooterette powered by either a 49.9cc Trojan or a 79cc JAP two-stroke engine. The scooterette had a two-speed gearbox in-unit with the engine, telescopic forks and 4-inch drum brakes. The moped was single speed, with smaller brakes and no suspension. Both had 23-inch wheels and a limited market.
For 1960 the single-speed 79cc JAP engine was listed with telescopic forks, but failed to qualify as a moped.
Sources: Graces Guide; The Moped Archive.
Graham Clayton writes in comments,
"Road test of the Joybike in the July 9th, 1958 edition of "Cycling" magazine:
https://www.icenicam.org.uk/library/Powell/Joybike_road_test_1958-07-09.pdf"
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