Very cool, I think what you have is a transion 1R to XA stem. I can't say much more than that except they are rare and that makes them way cool! More pictures of the Marinoni!
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1 Super Record bike, 1 Nuovo Record bike, 1 Pista, 1 Road, 1 Cyclocross/Allrounder, 1 MTB, 1 Touring, 1 Fixed gear