This is from the site Bring a Trailer (https://bringatrailer.com/) ...
This 1969 Honda Monkey Z50A was originally built for the Japanese domestic market according to the seller, who states that it was imported to the US by a service member returning from Vietnam. The minibike is said to have been purchased in the 1990s by Honda motorcycle restorer Jan Harde, who reportedly carried out a subsequent refurbishment before the seller’s acquisition 20 years ago. Power is from a 49cc single with a three-speed semi-automatic transmission, and the bike has not been ridden under the seller’s ownership. This Monkey is offered at no reserve for off-road use only with a California bill of sale.
The Z50A Monkey featured a different design, seat placement, muffler, and tires as well as inclusion of a horn, turn signals, and speedometer when compared to the contemporary US-spec Mini Trail. The fuel tank and fenders on this example were finished in silver while the frame, side covers, front end components, and headlight were painted blue in the 1990s. Solid disc wheels are fitted with replacement street tires, and braking comes from hand-operated drums.
The 60-kph speedometer houses a five-digit mechanical odometer which was reset as part of the refurbishment reads less than one kilometer. Total mileage is unknown. The bike features turn signals and a horn.
The SOHC four-stroke 49cc single and three-speed semi-automatic transmission are said to have been rebuilt as part of the 1990s refurbishment, though supporting records are unavailable. A box muffler sits under the transmission and exits on the left ahead of the rear tire. The engine has reportedly not been started under current ownership.