Yeah, it's an old Model T coil. I've seen them with and without the script brand. And by brand, I mean actually burnt and branded right into the wood. I have one of the script ones like that, as well. I keep it on my desk. ;-)
A Model T indeed. For being 100-year-old technology, those old wooden buzz-box coils really pack a wallop! They'll throw a big, fat, evil blue spark like no modern hi-po coil I've ever seen. Non-stop, too! One of those with a switch and a 6-volt battery make a pretty effective security system.
They're definitely coils. The T's did all have a magneto for generating the DC power to run them, but while Ford called it a magneto, it's more like a primitive generator. Basically just a ring of magnets on the flywheel with matching set of stationary wound coils. No resemblance in appearance or function to an ignition impulse magneto. The later T's had both the magneto and an engine-mounted generator, electric starter, and a 6-volt battery. You could start and run it on the battery electrical system or if your battery was dead, you could flip a switch and start and run it with the hand crank and magneto power.