Paul A. Price of Roslyn, NY started in the toy making business in 1951, and formed his own company, Paul A. Price Co., in 1955. Price trademarked the name Papco in 1962. The company was very successful in the dime toy vending machine market. Their most popular toys were miniature plastic football players.
Papco did so well that in 1965 they expanded their Roslyn plant to increase the capacity for manufacturing larger injection-molded toys. Papco introduced dozens of new toys each year for the rest of the 60s as mounting pressure from cheap Hong Kong imports threatened their business. By 1970, Papco appears to have disappeared.
The Paul A. Price Co. announced in May 1966 an exclusive deal to distribute Wham-O Mini-Balls in dime packages and gum ball machines. I'm going way out on a hypothesis limb to say Price went to San Gabriel to meet with Wham-O and was shown a Frisbee. Being a miniature toy guy, he decided to make one in dime toy size. To circumvent any infringement issues, he put 6 vanes in the flight plate as if they would improve the aerodynamics. It was produced in a 4" diameter size with the Papco name for sale on dime toy racks.
It wasn't until November of the following year that Wham-O announced the Mini Frisbee in a similar size and shape, minus the vanes.
Papco Minis were unique with 6 vanes marked "Bend In" on the surface. 3.75" diameter. Known colors are red, yellow, orange, light green, dark green. Quality is poor with mold imperfections and surface warping.