Aah! Made in Watford! Never saw any S. G. Brown headsets but have used S. G. Brown headphones for 'short-wave listening'. Earliest CAA (and predecessors) headsets I remember (MoA, SATCC, mid-sixties) were Amplivox Jetlite. The rubber mic holders would perish and the mics fall out. About the same time there were a few Amplivox Astrolite about.