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It is Columbus Matrix! Would love to see a picture of yours because I've barely come across another since owning this. Also, it might give me some build inspiration to get Chirac and Five-Hats off my case! (Just kidding, those comments are fair.)
I haven't owned it from new so I don't know if the previous owner has done some cold-setting magic on it. Currently has a seven speed rear wheel in there.
I've got that exact same frameset, Columbus Matrix no?
Or maybe not cos I could only squeeze a 5 speed freewheel in there