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Geneva Seal

Geneva Seal is like the C.O.S.C., it shows a watch meeting some requirements and increases the value and price of a watch.

However, C.O.S.C. emphasizes on the accuracy of time keeping while Geneva Seal emphasizes on the craftsmanship of a watch.


1 (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.

1 (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.

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.

The balance spring should be pinned up in a grooved plate with a stud having a rounded collar and cap. Mobile studs are allowed.

Split or fitted indexes are allowed with a holding system except in extra-thin calibers where the holding system is not required.

Regulating systems (balances) with variable radius of gyration are allowed provided they comply with criteria 1 (A) and 1 (B).

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.

In wheel assemblies, the pivot shanks and the faces of the pinion leaves have to be polished.

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.

The angle traversed by the lever is to be limited by fixed banking walls to the exclusion of pins or studs.

Movements fitted with shock proofing are accepted.

The ratchet wheel and the crown wheel should be finished according to registered patterns.

Wire springs are not accepted.


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