In reply to PJ2398:
I had a pair years ago, the red ones with the alveolite expedition inner. They were good, but fitted wide, but in terms of sizing I seem to remember I had to size up to a 48 or 49 (I'm usually a 47 in Sportiva etc) but with packing down of the inner they became a bit sloppy. They had a relatively low profile toe box which made them good for mixed climbing and any (relatively) precise footwork. Mugs Stump wore them on his big climbs in Antarctica and Alaska.
I'd agree with the above about possibly shattering. Civettas were pebax, like Asolo ASF 101s, so they were softer, unlike Koflachs or Scarpa Vegas - which now commonly shatter in the cold if they're 20+ years old - but I still wouldn't risk it. Modern boots are so much lighter, warmer and more comfortable.
Post edited at 21:02