I'm an idiot, I figured out part of the steerer label> DEDAUO So the painters knew what tube sticker to fit I guess. A picture won't help much, I needed an ultraviolet light and a magnifying glass to read it. My impression is same as yours, that the seatstays would be Columbus something or other. Don't lose too much sleep over it, we can just accept it as a mystery. You could add G2350 to your file, it's a last version MXL in DRR colour.