Sometimes you can find out inside the clock a date usually printed in red.
This date doesn’t mean the production date of the clock, but means that the clock pass throw the Quality/Maintenance area (this area was inside the Solari Udine) for a repairing it.

If you find out other things like the first pic “1970 R” this means that the clock was repaired in 1970

LUGLIO 1962 - JULY 1962

APRILE 1964 - APRIL 1964

MARZO 1962 - MARCH 1962

9 OTTOBRE 1961 - 9 OCTOBER 1961