This is from the site Bring a Trailer (https://bringatrailer.com/) ...
This 1958 NSU Quickly S moped was acquired by the seller while on a trip to England in 2014 and subsequently imported to the US. Finished in two-tone green, the bike is powered by a 49cc two-stroke single which was refurbished by the seller with a new cylinder, piston bearings, seals, case half, and more. Additional work under current ownership included replacement of the dry clutch for the two-speed transmission as well as replacing bushings on the leading-link front suspension. This Quickly S is offered with a 428-page binder of factory literature and manuals, UK registration, importation documents, recent parts receipts, and a California bill of sale.
NSU built more than a million Quickly mopeds from 1953 to 1968, and the S version featured larger fenders, a speedometer, and chrome wheels. This example is said to have been repainted under previous ownership with a dark green frame, fenders, fork, and luggage rack as well as a lighter-hued headlamp housing and fuel tank. A ding and scratch on the fuel tank are pointed out in the gallery, and the seller has not been able to source the correct headlamp bulb.
Wire-spoked 26″ wheels feature chrome rims and are shod with 26″x2.00″ tires. The seller has installed new bushings on the leading link front suspension as well as replacing several cables. A kickstand holds the moped upright when parked.
Instrumentation consists of a 45-mph speedometer and a five-digit odometer reading approximately 11k miles, approximately 500 of which have been added by the seller. An ivory-colored single seat and grips are fitted along with a fuel cap bearing an NSU Weltmeister crest in tribute to Grand Prix championships won between 1953 and 1955.
The two-stroke 49cc single was refurbished by the seller with a new cylinder, piston bearings, seals, and case half. The carburetor was rebuilt and the two-speed transmission fitted with a new dry clutch.
The identification tag indicates that this Quickly was built at the Neckarsulm plant in Germany that would eventually serve as an assembly facility for Audi vehicles.