Here's the underside. Yes, it was certainly worked on. Maybe in the 80s? Those are some nice looking 10kV Sprauge caps. Sure hope the are still good.
What's going on with the ceramic trimmer cap up top ?
That's what. Someone has indeed replace the HV coil and re-engineered the driving circuit.
That multi-deck coil reminds me of the one Dumont used in the "Clifton"
I did try powering it up and managed about 2.5kV by tweaking the cap. That's only about half of what it should be.
I'm leaning towards restoring the original circuit using a coil from a Motorola TS-18