The only way to figure out what it does now is too probe the terminals, or melt out the potting compound. It won't be repairable.
I'm pretty skeptical about it. Clearly it uses the points somehow as a trigger. But with the points open (fire), the unit can't drive current through the coil, which means it is still relying on the coil's field collapse to make spark voltage, just as it does when wired up in stock configuration.
What this means is that when the points are closed, the points still provide the charging current to build the coils magnetic field, which heats the point contacts. So, it is not clear what benefit the unit provides.
...Unless, it is some sort of CD unit. But then, I'm still uncertain how the unit could drive high voltage into a coil when the point contacts are open.
But, then therein may be the reason they marketed the unit as See/Dee rather than CD. It's not CD either.
I remain skeptical. Hit it with power and see if the black stuff oozes out. If you probe it, beware that some actual CD units poke out 300-400 voltage spikes, which could damage a common DMM.
Perhaps it is a voltage booster, or DC-DC converter. Battery volts in and constant 15V out. Raising the driven voltage into the coils, would make a bigger mag field and therefore higher voltage spark. But, that wouldn't benefit the points, rather it would heat them up more and wear them faster.
I will caution that DC-DC converters may do their job with oscillators and transformers or Capacitors, (or both). If there is an electrolytic inside, they need power applied regularly to stay "formed". Idle storage and they essentially short themselves out, and or change their operating value, which may be harmful to transistors also in the circuit.
But, at this point, it will either work or it won't.
