olly708 - By the looks of your photo's, that frame was made before 1974. I say that because Dad brought us over to the USA in Feb. 1974. We lived in Tucson for ten years before moving back to England for 18 months. That frame was not made in Tucson, and not on the 18 month stent.
Thank you all for keeping his name out in the web.
cheers
Stuart Laing