Chance Vought designed and initially built the F-4U Corsair. Because of the demand during WWII Chance Vought, like all other manufacturers, subbed out additional production of their planes to other companies.
The Brewster Corporation was one of the companies to open up a production line for Chance Vought Corsairs. Brewster only built 735 Corsairs. It was taken over by the Navy because of quality and schedule issues and eventually went out of business. The F3A-1 (Corsair Mk. III) was the designation for the Brewster-built F4U-1. This is the only flying example of a Brewster Built Corsair in the world.