Holdsworthy moved to 1 Oakfield Rd (rear cover) between May 75 & May 76.

The Velox says improved for 1977, suggesting the brochure to be late 1976 for 1977 (presumably for the Olympia Show) or 1977.

The rear cover says Claud Butler frames have been made for over 40 years. Claud started in 1928, it would be 50 years in 1978, re-inforcing late 1976 or 1977.

A later 1977 or early 1978 CB catalogue (probably launched late 1977 for 1978) says CB frames have been made for over 45 years. In it the Colstar gets Universal 77 brakes (launched in 1977), wheras here the Colstar has Universal 68's (launched in 1968), so it is earlier.