Circa 1950, the F.A. Reynolds single horn in F was rebranded as a “Contempora” model and the B♭ model was introduced with three or four valves.
Notes and Quotes
1966 Reynolds catalog:
[Contempora FE-11 is] Reynolds’ finest single horn, incorporating all the best features of all our French horns. Remarkably free-blowing, with a perfection of scale in all registers. Solid nickel-silver throughout. Eb slide available at slight extra cost.