What a nice find!
Beautiful frame. It's a pity pretty much everything else seems to have been replaced over time, except maybe the saddle, seat post, bars and stem.
The "Super Sport" moniker puts in the sixties. It was the popular name at the time for bikes that were in a market segment between "Sport" and "Race". Light, expensive and the best you could have for your Sunday afternoon out. They typically came from established frame builders or well-reputed factories. There are some examples of these bikes to be found online, if you're interested in getting it back to period-correct spec. I'll see if I can find some examples.
These are a couple of my own examples from that period.
A RIH Sport "Super". Built by Willem Bustraan jr. in early 1965. As it came to me, and clearly suffering from the same "upgrade-itis". Only the Campagnolo Record transmission, and maybe the rear rack, are original:
And a Joco "Ronde van Europa" from a couple of years earlier:
