eBay and Craigslist finds

Is there an obvious way of making sure a basso frame is genuine? I'm looking at getting a second hand basso that I have found for sale to start a project, the frame geometry looks very much like similar basso steel frames I can find images of, but is there a way of checking when I go to see it? Thanks. No problem if not, I'll probably still go for it as it's near enough to collect.

panto'd bits; rear brake bridge, top of seat stays, fork crown

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