The longest lived Holdsworth model, a Cyclone was offered almost continuously (not 1964) from c1934 to 1976, although the variants changed enormously in design.

In the 1930’s people usually bought a complete cycle, it was relatively rare to buy a frame alone, as the 1934 catalogue indicates. The Cyclone was only offered as a Path racer in 1934, it shared the top of the range spot with the Mistral and Sirocco. full 1934 catalogue

1938 The Cyclone is now a Road Cycle or available as a frameset only.

full 1938 catalogue