NVT Ranger 50.
eBay ad says:
"Very collectable little bike Norton Villers Triumph Ranger 50cc, twist and go automatic. It does around 20 mph. This runs and rides and pulls me at 12 stonne. It has a brand new front mudguard and a new body/tank/seat unit painted in a pearlescent purple.
It has the original ranger covers even for the brakes as pictured and it is in very nice condition for around 40 years old.
If you wanted to make it like new the wheels would require a rechrome and the swing arm, but lets face it is very old and in very nice condition for the age. The only thing I can see it needs is new steering head bearings, same as a cycle cost around £2. And the fuel has to be turned on with a spanner or pliers as it is missing the small plastic dial."