Internet wisdom tells me they were made between 1956 and 1972 by the Shaw-Harrison company. They were available in a number of designer colors, including my beige.
I’ve loaded mine with a roll of Ektar 100. Despite published reports, I was able to trim the plastic 120 feed spool and fit it in the camera. It was still necessary to use a genuine 620 takeup spool.
Camera Wiki doesn’t have much information but does have photos of the different colors.
Manual? Not necessary.
Ebay has a few at good prices. I also noticed a few listed on Etsy for insane amounts. Old & funky does not necessarily equal rare & valuable. Buyer beware.