I can't tell you much by way of specifics but if it helps, you can date Atalas by serial number. They were formatted starting with a 2 digit year of production.

I do remember(somwhat) 5s Turistas from the very late sixties through early seventies. IIRC the most popular color was yellow w/green, and they had Campy Valentino RD and hubs & Weinmann or Barilla C-pull brakes.

At the time Stuyvesant was the exclusive importer and both retailed and wholesaled them.

As for current value, I have absolutely no idea, since I've never tracked that kind of stuff.