George A. Finder and Nino Marcelli set up a Plastic Ukulele manufacturing company in San Diego in 1950. The most famous branded product was the Diamond Head. Finder owned the patents for the design, even if production is credited to a plastic factory, and it was used on a lot of other brands of Ukulele over the next decade The ones I have seen were predominantly white fronted with a coloured, often faux wood sort of marbled brown, back and sides. Some were entirely faux wood and some particularly the Royal Hawaiians had a painted black fretboard. There were only ever Sopranos made and it should be remembered that this was the first plastic Ukulele, production was started before Maccaferri and Finder got his patent 3 months before Maccaferri, (these facts were a large part of Chris Kratt/Emenees defence in the patent court cases with Maccaferri). Other Fin-Der (hyphen to differentiate from Fender) designed Ukuleles I have seen are are

Aloha - the plastic ones only

Cliff Edwards - endorsed by Cliff "Ukulele Ike" Edwards, (the voice of Jiminy Cricket), to compete with Arthur Godfrey endorsed Emenees

G. P. Co. Maui

Kona Isle

the Lisa - came in white fronted or all marbled

Mauna Loa - the plastic ones only

Nashville Superstars

Reliable - a Canadian firm who didn't copy the Patent Tuning Pegs and used plastic friction ones They also did a number of Ukuleles for Disney so there are a number of Disney Character models

Royal Hawaiian - the plastic ones only - endorsed by Harry Owens the musical director of the Royal Hawaiian Hotel and leader of its house band the Royal Hawaiians, a top Hawaiian music act of the time (Paul Summers was also in the band for a while). Some have Harry's name on the front as well

Surf Rider

Teasers Hula Uke