An update. I had it in mind to change the points, this was hastened when the teeny weeny wire broke.
Via this wonderful forum my points were correctly identified with a part number. These points were used on a variety of Mazdas and Mitsubishi Motors.
Given that I'm in Japan I thought getting the points would be very straightforward - how wrong I was. I got my Japanese buddies onto Japanese Internet and then resorted to 'bush beating' all to no avail.
The parts were estimated to be for cars over 10 years old and 'unobtainable'.
I then found the points via eBay - they were in Australia and ultra-cheap ($7) so I ordered two sets - the postage was about $40 ............…
The parts showed up around Christmas - they were perfect - I regarded them as a present to me and the 4G.
But it was too cold in the workshop to do much, but they have now been fitted and the bike starts and runs well - starting the bike in the doorway, but too cold for a Test Run.
Next up is a bigger challenge - 1938 MSS Velocette - low kickstart ratio, thick oil, cold weather and old legs have always made it a difficult starter.
The 1939 VB is much easier.
I'm waiting for a dose of Global Warming...………….
Best regards to everyone in Australia, I'm hoping you are all fit & well and not impacted by bushfires.