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The pronounced material at 6.oclock of the case is the construction for the case back hinge system.

The pronounced material at 6.oclock of the case is the construction for the case back hinge system.

The small elliptical jewel in the centre of the image fixed to the polished steel circular plate is where the escapement lever (anchor) impulses the balance for it to oscillate.

The small elliptical jewel in the centre of the image fixed to the polished steel circular plate is where the escapement lever (anchor) impulses the balance for it to oscillate.

Each bridge has '1' stamped on the underside of the bridge to assure that when they were originally assembled they would not be mixed with other movements being made. Each calibre made despite being the same in design was not interchangeable in component. The components were made and adjusted individually for each watch.

Each bridge has '1' stamped on the underside of the bridge to assure that when they were originally assembled they would not be mixed with other movements being made. Each calibre made despite being the same in design was not interchangeable in component. The components were made and adjusted individually for each watch.