The dual single coil pickup "Clubman Bass" was among the first guitar models mass produced by Vox. The styling of these early Vox entry level basses was influenced by popular Fender guitar models from the 1960s. It was produced in the UK from 1961 through 1965.
Dick Denney, the lead engineer at Vox, indicated on page 21 of his 1992 book "The Vox Story," that the first Vox guitars were produced under subcontract by Stuart Darkins & Co., a furniture maker in Shoeburyness England. After 1963, production was shifted to G-Plan of Hemel Hempstead, another UK based furniture maker.
The necks used on the Clubman Bass did not have an adjustable truss rod. Rather, it had two non-adjustable steel rods embedded in the neck..
The Clubman Bass appears in the 1965 US Vox product catalog, seen below. A reprint of this catalog is available from North Coast Music, just click on the catalog image.
This catalog described the Clubman Bass as "A low-priced fine quality bass guitar, with two Vox bass pickups for maximum low-frequency response. Separate tone and voilume controls, single side gear heads. Natural polished neck reinforced with two embedded steel rods, with rosewood fingerboard. Finished in red or white high gloss polyester."