The Carrera series was made by Montblanc between 1971 and 1979. These were school pens, that is, inexpensive entry-level models, priced at the time a little above the comparable Pelikan school pens. It does happen that an unused example surfaces from old shop stock decades later: pens like these are traded as “new old stock” and fetch somewhat more than used ones, though that does not alter when they were made.
In placing them it matters that Montblanc positioned itself consistently as a luxury-goods maker only from 1991. Before that the range, much as at Pelikan or Lamy, covered everything from the school pen to the Meisterstück. A Carrera is therefore not a luxury product merely because it says Montblanc on it.
Prices are correspondingly low: the range was mass-produced, supply is still plentiful and the circle of interested buyers small, because to many collectors the 1970s are still too recent. Propelling pencils from the series were fetching some 30 to 45 euros in 2015. Collectors report that Carrera fountain pens could still be had for under 20 DM in the 1990s, so the level has roughly quadrupled since. A Carrera makes a perfectly good everyday pen; as an investment it is no use at all.