So I found a Basso Evo, no clue what year, but it has 600 Tricolor Ultegras on it.

I was offered to buy at $450. Is it worth $450? Does anyone know what the msrp on this bike could have been?

Perhaps move to the Vintage Forum?

Do another search (on Google too) and you will see that a guy named Richard from this forum picked it up a couple of months ago for $299 (maybe less, that was the asking price), and he is just trying to flip it.

Basso are a great brand (I have one), but that is probably one of their least desirable models, in my opinion. Doesn't have that vintage steel style that most people like, nor it is really modern, if you are after that. Plus those components are very underwhelming on a bike like that.