Thanks Dennis.
It says
Summary
The movement is a calibre 89, dating from the year 1949.
The case was most probably produced resp. delivered around 1951.
Valid entry in "Index of Movement Numbers"
1949 1,181,201-1,196,800 c. 89 - 12lig. INCA S.C.
Valid entries in "Index of Case Numbers"
1950-1960 1,176,000-1,495,000 current IWC index compatible with old list from 2001
1950-1954 1,200,000-1,300,000 old IWC index compatible with new case index of 2002