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how to make a large wristwatch case?


I am a collector and amateur restorer of wristwatches and I have a couple of projects which require purpose made watch cases. This is because they are old pocket watch movements that are typically 40mm plus in diameter and in one case the crown is at 12 o'clock not 3 like a normal wristwatch. The standard OEM watch cases are generally too small and I am looking for something a little more elegant (but still masculine) to show off these beautiful vintage movements and dials (as such I intend to use a crystal back as well as front).
I would like to do one of the watches with a yellow gold front bezel (if not a gold body) to set off the gold leaf/plate(?) numerals and hands (on a white dial). The body, lugs and back crystal bezel could be in silver (may even be preferable) as the exposed side of the movement is predominantly white metal with gold train and jewel holes. I have been thinking stirling silver for the main body and perhaps 18Kt gold filled base metal or solid 18kt gold for the bezel. I have no experience with jewellry making and would be very grateful for any suggestions regarding techniques that a keen novice could use to get a professional result. I would also be looking at jewellers screws to connect the 3 pieces.

Just out of interest the second movement does not have a particularly interesting or aesthetically worthy dial so I am toying with titanium for the second project...........

You need a machine shop !