An Italian bicycle company established in the 20's, named after a famous Italian racer of that time. It's one of Italy's grand old brands that included Atala.
Bottechias seems to have faded a bit from the limelight in the late 70's and 80s when other brands like Masi, Ciocc and Guerciotti were noticed more by riders with their more modern graphics and in some cases, frame designs.
The Bottechia in that CL add looks to be an entry level racer as the frame tubing is straight guage Columbus Aelle. It's a little heavier than SL (which is butted) but should still give just as good a ride as geometry would always matter more than tube weight. The over $500 price might be a bit high, unless the bike might be mint with very low miles. I would think $400 ish would be a good maximum for that Bottechia.
JMO

Chombi