......which is a bit of a legend and mystery within the IWC Mark family.
Fact is:
- it does not have "Incabloc" shock protector
- the first two Batches (2x 1200 pieces) of Mark XI for the RAF were delivered w/o Incabloc (exact serial numbers are known); RAF feared Incabloc would make the watch less accurate.
- my white dial Mark XI falls into this correct Non-Incabloc-Serial (it is actually the 18th Mark XI for the RAF, so really early)
- all subsequent Mark XI for RAF (beyond the first two batches) were produced with Incabloc
- all white dial Mark XI spotted so far are non Incabloc versions belonging to these first two production batches
Mystery:
- have the non Incabloc watches later been modified with a white replacement dial in order to make clearly visible within RAF which ones were Incabloc, which ones not?