It most likely is a car coil, but i can't say for sure what car. But I'd suggest some more testing before throwing parts at it.
1. Pull the spark wire out of the coil tower, then remove the wire from the distributor cap (it un-screws). Now reinsert it into the coil tower and rig up a spark gap off the threaded end. Crank engine and observe for sparks. Should spark four times per revolution. If it does, the points are at least opening and closing, and the coil is working.
2. No sparks? Remove the wire from the negative side of the coil (-) and attach a piece of spare wire to the same coil terminal. Turn the key on and tap-tap the wire spare to ground, observing for sparks as before. Should spark as you do the tap-tap, showing that the coil is working..
3. Still no sparks? Replace (-) wire to coil and check voltage at the coil (+) terminal with key on. Should show about 12V or about 6V depending on whether points are open or closed. No or low voltage? Check ignition switch and wiring to the coil. Keep in mind there is a resistor in the circuit.
4. But got sparks? Check distributor rotor. They are noted for pin-holing and arcing through to the distributor shaft.
These are common tests that any grey-haired car mechanic will be familiar with. After all, it is basically a car system.
Good luck.
