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https://community.ebay.com/t5/Archive-Watches-Clocks-and/What-is-Switzerland-20-Microns-Plaque-ORL/td-p/1987163
Nov 13, 2007 · "Plaque" = Plated, "OR" = Gold, so your piece is plated with 20 Microns of gold.Estimated Reading Time: 50 secs
https://quickjewelryrepairs.com/articles/gold-plating-jewelry-thickness/
Sep 16, 2019 · It’s a little hard to visualize, but basically any gold plating that’s 1 micron or up is good quality gold plating. As a comparison, flash plating is less than one micron- it’s actually under 0.175 micron. You can imagine how thin that is considering the size of a regular micron. For every type of jewelry, there’s a recommended micron ...Reviews: 3
https://www.antique-jewelry-investor.com/can-something-solid-gold-also-have-a-stamp-that-reads-plaque-20-g-comments.html
Plaque 20 g stamped on the watch case, means the metal is not sold gold but plated with 20 microns of gold. You can find Cartier manual wind mechanical movement, watches, stamped "Cartier" "PLAQUE OR G 20 M" "Swiss" Omega also made (1970s) watches, that were marked on the side 20 (for 20 microns) with the Omega insignia inside a triangle.
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