im pretty sure that they did not make the frame in 1964 for a motorcycle that's production run started in 1969 ? or could i be incorrect ?DDU- It's a British frame from the '60's. https://cybermotorcycle.com/euro/wikig/Scorpion.html
Start a thread on the frame, there are some older British racers that are members here and are extremely knowledgeable. They may be able to give you background.
its painted now !