riporto il pezzo in cui descrive le modifiche che IWC fa negli ETA, che arrivano smontati.
Like all other calibers that
IWC orders from outside sources, the ETA
2892 inside the Mark XVI and the Valjoux 7750
inside the Pilot’s Chronograph have been laboriously
reworked, primarily to minimize friction.
The movements are delivered to IWC’s
factory as kits — collections of undecorated individual
pieces, many of which are then
processed. Each barrel is meticulously measured
and, if necessary, re-milled. The polishing
on many of the pivots and the surfaces of
the gears is also retouched. Numerous components
are engraved and given decorative patterns
before the kits are passed along to the
watchmakers for assembly.
The most obvious change IWC made in the
Valjoux 7750 is the regulating system: it’s completely
removed and replaced. Rather than the
standard sheet-metal index pointer, IWC in-
stalled a Triovis fine adjustment mechanism.
The screw in this mechanism enables far more
accurate adjustments than the pointer or
“tail” on the original index. IWC’s experts add
visual appeal to the calibers with polishing on
the screws, cylindrically ground chamfer on the
rotors and plates, sunburst decoration on the
barrel wheel, and circular graining on the
plates, lever and escape wheel.
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