636 is some kind of ignition tool for bending points,
possibly plug electrodes, and, I think also for
adjusting the points on an old style regulator.
I bought it forem the Snap-On man, probably
in the late 1950's. It is marked
NO 115
K-D MFG CO
LANCASTER PA

I doubt if K-D tools still makes it....
Dinosaur Joel in Florida