If no spark is observed...
Does it have a kill switch that is off?
I believe that vintage did not have a lanyard switch.
The switch is likely a spring loaded push button aka a momentary switch.
It grounds the primary wire for the coil.
A failure here is unlikely but not impossible.
To test this you can remove the wires from the back of the switch and keep them separate from each other and the metal chassis.
That will exclude the switch.
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