This is from the site Bring a Trailer (https://bringatrailer.com/) ...
This 1960 Norton Dominator 99 is a restored example of one of the first featherbed frame-equipped models. The featherbed frame was groundbreaking for the day, and offered a combination of rigidity and lightness not seen in the company’s previous offerings. The bike was repainted during the restoration, and has a high quality finish with only a few minor defects. This 600cc bike and its 500cc predecessor paved the way for the later sporting Nortons. It is sold with a clean Indiana title in the seller’s name.
The Dominator name debuted in 1949 on the plunger-frame Model 7, but was brought into the modern era with the Featherbed frame on the Model 88 in 1952. The double-downtube Featherbed frame was lighter and stiffer than most contemporary frames, and afforded excellent performance for the day. The paintwork, saddle, and bars are all new, and the bike appears unmodified.
Some scuffing is apparent on the inner part of the forks from the front fender installation.
The brightwork and knee pads appear to be in very good condition, with intact black enamel around the Norton name. Cabling appears to be correct with mid-cable adjusters and neat routing.
The odometer shows 537 miles and was likely reset when the previous owner restored the bike. The Dominator’s instrument layout includes a speedometer and amp gauge mounted on the headlight, along with the large raised ignition switch. All of the electrical components are said to be in working condition.
Like most British bikes of the period, the Dominator used a non-unitized engine. The 4-speed transmission has its own case and does not share oil with the engine as on the majority of modern bikes. The 600cc twin is based on the Norton Model 7 of 1949, albiet enlarged and fitted with an alloy cylinder head. It is said to start and run well, and the chrome exhaust headers show little discoloration from use and heat cycling.
Engine #91275, can be seen above and corresponds to the frame stamping. The “14” is stamped by the Norton tag on the engine case and as a prefix on the chassis tag, and confirms this as a 600cc Dominator 99.
An original parts book, and a slightly later owner’s manual for the same model are included with the bike. There are no past service records for the bike, though the seller’s mechanic has performed some general maintenance.
The seller describes this bike as running and riding well, and will cruise at 80 miles per hour.