The Series B was a moped built by Puch. Puch supposedly manufactured everything except the frame, which was made in the USA by Murray, but this has not been confirmed. They were only made in 1980 and 1981 and were only available in a color called "wine".
The Series B, sometimes mistakenly referred to as the "Puch USA" or "Murray" had a unique trapezoidal tank on a frame basically identical to the frame found on Murray's line of department store mopeds. The engine was an E50 and the main thing that sets it apart from other Puchs is the use of CEV switches as opposed to the usual chrome or plastic box controls found on all other Puch models. Also electrical connections were made through a single multi-pin plug as opposed to a wiring block. Other differences include a unique handlebar mounted speedometer mount, single seat without the PUCH logo on the back and standard issue Leleu hubs laced to American made Sun Metal Products "wide" rims.
Some Series B-style models have popped up with Spanish warning labels and equipped with a Dellorto Carburetor as opposed to the usual Bing model. Not much information has been found on these.
