unfortunately, the practice of Columbus was to provide marketing schwanks with columbus stickers to match their other advertising zeal. See Columbus Moron tubing from Ibis (more on the ends...). Whilst that was Ibis' exceedingly refined sense of humor, other marques took advantage to label their tubing as something special. Unless you can find some insider info on the tubing composition, the data will be lost in the sands of time. (You might run a fingernail around the back side of the seat tube, inside, and feel for a ridge. This would make the tubing seamed and probably aelle. Conversely, the lack of a seam implies a more upscale tube set, like cromor. The seat post size may also be indicative, as the more expensive tube sets were thinner and maxed out at 27.2 mm. The mangusta is an all-right bike, as I recall. Just a kind of wierd foray into road bikedom from a BMX/Mountain Bike company.