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giorgio_porco
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CITAZIONE (squelette @ 3/9/2019, 09:43) Me lo chiedevo anch’io, e in realta’ la parte esterna è oro 18k , da Gold in Watchmaking, Lucien F Trueb, Gold Bulletin 2000, 33(1) 11-24 :
Gold crowns and pushers are a must for solid gold watches; they cost up to 4 to 10 US$ a piece even though they weigh only 0.25 to 0.5 g. They are made from round or flattened 18 ct rods, respectively, which are cut in sections and given their outer shape (and logo) by impression die cold forging, with usually just two passes followed by washing, polishing, annealing and some lathe cutting. Remarkably, the volume of the raw gold cylinder is calculated so accurately that absolutely no flash is formed during the forging operations. No polishing is required after cold forging either, as the dies are made to exacting specifications; crowns requiring a mirror-type finish are diamond burnished. Watches with gold plated cases are fitted with electroplated stainless steel crowns, which are fabricated just like solid gold crowns.
Quindi una specie di gold capped?
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10 replies since 2/9/2019, 00:29 349 views
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.Me lo chiedevo anch’io, e in realta’ la parte esterna è oro 18k , da Gold in Watchmaking, Lucien F Trueb, Gold Bulletin 2000, 33(1) 11-24 :
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