I had a 'curly' - ordered it from Jack Kirk, in Ferensway - in 1961. Campag, Mafacs, Fiammes. Loved it...
'Curly' Hetchins: https://www.google.co.uk/search?q=curly hetchins&es_sm=93&tbm=isch&tbo=u&source=univ&sa=X&ved=0CDMQsARqFQoTCOaelLCjxMgCFQftHgodvoANaQ&biw=1366&bih=643
Mine was a 1962, delivered to Jack Kirk in the spring of 1962 according to the Hetchins registry. It would have been nice if it had been curly.....
Allegedly helped reduce 'whip' (side movement when accelerating?) Looking at most carbon bikes now they have multi shaped stays to do all kinds of 'magic' aka marketing
The British library are releasing over a million photos that are old enough to now be free of copyright, and the collection of cycling photos has a few interesting ones. https://www.flickr.com/photos/britishlibrary/sets/72157640537276514
my road bike has a Brooks B17,Cyclo Cross a Brooks Cambium,and my mountain bike has the saddle it came with,though might change to a Cambium at some point.