The upstroke is the C — do a semaphore C for yourself & you will find your left arm is vertical.

Oddly enough, I wasn't 'there' in the 60s - in the sense that, just married [Mar 59], establishing self in new career as teacher [Sep 58 ···], leaving London for Cambridge for my wife's 'mature scholar' education [62], I was inactive in folk & in the hippy thing [for which I was a bit old being by then in my 30s] & all the other manifestations of '60s culture': becoming a freelance critic — theatre {for The Guardian] and folk-music [for The Times] — as well as a teacher at end of 1969 [first reviews in both papers appeared in same week in Oct 69].

So forget the 60s — I can remember the 30s, Sonny-Jim: lived right thru WWii in 40s; National Service officer, University, & career-launch thru 50s — so as the [alas deceased] lady said to you: Dont·Come·The·Cowboy·With·Me...]