This is from the site Bring a Trailer (https://bringatrailer.com/) ...
This 1962 Centaur FS4 (chassis 122211) is one of a few thousand built, one of which has already been featured on BaT. These 50cc two-stroke single/centrifugal clutch scooters weighed ~90 lbs., and can be folded into a portable package roughly the size of a large suitcase. Designed by Lambretta‘s US importer James Poster, these neat little scooters were marketed to boat and small aircraft owners, and with a respectable 40 mph top speed they sold surprisingly well over a five-year production run that ended in 1965. This one sounds to be unrestored, and the seller says it runs and operates well following a recent service. Find it here on eBay in Stanton, California for $4,490 OBO.
It seems most Centaurs were originally painted white, red, or green/blue as seen here, with a couple of different seat color options as well. Handlebar controls consist of a twist-grip throttle on the right and a lever for the single brake on the left.
In addition to the rear luggage rack, a matched set of soft-sided saddlebags were a factory option, but don’t appear to be included here. The pull cord handle used to start the bike can be seen above the swing-out foot peg on the right side.
This photo shows the scooter in all folded up, roughly the size of a large suitcase. Folding or unfolding was described in period ads an easy three-step process accomplished in about a minute thanks in part to a detachable front wheel–there’s also a sealable fuel vent that allowed the bike to be stowed in any position without worry of leaks.
The ad doesn’t include any direct shots of the Clinton two-stroke single, a 50cc unit that was good for about 5 horsepower when new and managed to return nearly 100 mpg. A top speed of 40 mph was reportedly attainable while the bike’s carrying capacity was an impressive 400 pounds.