Originally Posted by Trakhak

alicestrong is the first poster to mention the Vitus tubing. Apparently none of the other posters noticed the pale blue Vitus sticker on the seat tube. (In fairness, I noticed it only because I looked for it, having sold Motobecanes in the mid-'70s and knowing that that model had the upgraded tubing.) A mixte with butted Vitus tubing---arguably equal in quality to the Reynolds 531 Raleigh used on a few of their mixtes---is rare and easily worth the highest estimate posted so far.