ah the choke lever, have just re read the year by year notes and see chokes were relocated from '59 to the frame.
The bike is being put together in american trim as that tinwear was easier to source although the bike was originally UK domestic, imported to NZ in '82.
I'm also fitting a modern BT-H pseudo mag that wasnt suitable for my race bike bender, so won't need manual ignition (a shame as I prefer it)
I'm tossing up trying to identify something that is as correct as possible or just getting the alloy type I have fitted to bender.
I'd seen some with a part number 60-2074/5 for later triumphs that appear similar (horizontal clamps, adjusters and no mirror holes -which the later A65's had) but are ball ended and have the choke on the handlebars
http://www.a7a10.net/forum/index.php?topic=5488.0