5 microns
Companies like Omega & Rolex even used thicker layers of gold back then
Antique Rocail 20 Micron Gold Plated Swiss Made Mechanical Good Condition Open Face Pocket Watch, Manual Wind Collection Watch
Omega 20 Microns Gold Plated dd6347 - Pre-Owned Mens Watches
Walzgold Double 20 Mikron Gold Plated Vintage Womens Hand Wind Watch 1955fairlane (6329) 99
1 at the best online prices
Omega
Replating a vintage watch back to the original manufacturer's specifications requires that the thickness of the gold plated layer (5-10 microns) be much heavier than normal
The Necklace: Mejuri Patra Linked Enamel Necklace, $168
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