Geneva Seal
Criteria
Picture & summary by
Michael Sandler
(from
TimeZone.com forum)
Thank you !
As you all probably know...Patek
Philippe and a few other brands are very
proud to state that their watches
contain
the Geneva Seal. In case
you were wondering, the following 12
conditions must be met in order for a
watch to contain the seal:
GENEVA SEAL
CRITERION NUMBER ONE (A)
The workmanship of
all the caliber's components, including
those of additional mechanisms, must
meet the
requirements of the office for optional
inspection of Geneva watches.
GENEVA SEAL
CRITERION NUMBER ONE (B)
Steel parts must have
polished angles and their visible
surfaces smoothed down.
Screw heads have to be polished, with
their slots and rims chamfered.
GENEVA SEAL
CRITERION NUMBER TWO
All movements must be
provided on the train and escapement
with ruby jewels having polished holes.
On the bridge side, the jewels must be
half frosted with polished sinks.
The end stone for the center wheel on
the base plate is not required.
GENEVA SEAL
CRITERION NUMBER THREE
The balance spring
should be pinned up in a grooved plate
with a stud having a rounded collar and
cap. Mobile studs are allowed.
GENEVA SEAL
CRITERION NUMBER FOUR
Split or fitted
indexes are allowed with a holding
system except in extra-thin calibers
where the holding system is not
required.
GENEVA SEAL
CRITERION NUMBER FIVE
Regulating systems
(balances) with variable radius of
gyration are allowed provided they
comply with criteria ONE (A) and ONE
(B).
GENEVA SEAL
CRITERION NUMBER SIX
The wheels of the
going train have to be chamfered above
an below and have a polished sink.
In wheels 0.15mm thick or less, a single
chamfer is allowed on the bridge side.
GENEVA SEAL
CRITERION NUMBER SEVEN
In wheel assemblies,
the pivot shanks and the faces of the
pinion leaves have to be polished.
GENEVA SEAL
CRITERION NUMBER EIGHT
The escape wheel has
to be light, not more than 0.16mm thick
in large calibers and 0.13mm in
calibers under 18mm, and its
locking-faces have to be polished.
GENEVA SEAL
CRITERION NUMBER NINE
The angle traversed
by the lever is to be limited by fixed
banking walls to the exclusion of pins
or studs.
GENEVA SEAL
CRITERIA NUMBER TEN
Movements fitted with
shock proofing are accepted.
GENEVA SEAL
CRITERION NUMBER ELEVEN
The ratchet wheel and
the crown wheel should be finished
according to registered patterns.
GENEVA SEAL
CRITERION NUMBER TWELVE
Wire springs are not
accepted.
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