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Thanks for the information.
DA on low end is unusual, indeed. But with a bike that's approx. 30 years old, strange things can happen. I've seen DA 11 speed on Aelle frames here on the forum, you know. ;-)
I'm about to dismantle it completely and I hope frame weight brings some more indirect information. But I suspect it to be resprayed because under the black paint of the fork, there's shiny chrome.
Brian Oblivion, er, Sheldon Brown says 26.8 but there's some bikes with 27.2, though this is rarer.
So, I suppose it's best to ask another Colombo owner that seatpost they take and what identification (serial, BB type) it has?
Isn't DA on a low end model unusual?