Hello neighbor!
Hugo, congratulations on acquiring that very rare Predicta. I have a US-built Holiday that was imported to Spain in 1960 and immediately placed into storage, it's still in new condition. I plan to power it up and restore as necessary once I get through a couple of other sets already on my bench.
I also have a couple of Philco sets from the same era that were built in Spain under license from Philco by Iberia Radio. They also have the voltage selector switch and European power cord. When I first saw that set on eBay I suspected it was made in Spain and then shipped to Italy, and when you removed the back I expected to see the luxury tax stamp on the chassis like every Spanish-made TV from that era:
But that seems it is not the case. The sticker that is partially missing has the text Matr___ - this is not present on the US-built sets, nor on the Spanish ones, so I wonder if that is from a set built in another European country. For sure, there is a Spanish brochure for Philco TVs that includes the Predicta so I know they were at least offered for sale here.
With respect to the UHF tuner, I think that was delivered that way from the factory. The CCIR broadcasts in Spain were moved to UHF in 1961, and I suppose in Italy as well, so the sets had to include a UHF tuner in order to work. Given that the back panel on your set has UHF antenna terminals and printing, I think it must have come that way. All of my Philcos, both US and Spanish, have UHF tuners, and they are all pretty much the same - they look like an afterthought and not part of the original design.
In your video you sound very knowledgable and experienced already but if there is any help I can offer, let me know. I'm just excited to know someone else in Europe has an appreciation for these sets!
Edited to add: they used the exact same circuit design for both the US (later NTSC) and European CCIR (later PAL) sets. Switching between NTSC and PAL composite signals injected to the video amplifier grid, the sets will sync right up. I was really surprised by that!