"Plaque" on a watch case typically refers to a layer of gold or another precious metal that has been applied to the surface through a process like electroplating. The "g" likely stands for grams, indicating the weight of the gold used in the plating process. The measurement of "20 microns" refers to the thickness of the gold layer, with one micron equaling one-millionth of a meter. This measurement indicates the quality and durability of the gold plating on the watch case.
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On a watch case, plaque OR G 20 microns means that the case is solid gold. The 20 micron relates to the thickness of the gold plating.
I assume you mean what is a hundredth of a millimetre. There are 1000 microns in a millimetre. This means 1/100 of a mm, i.e. 0.01 mm is 10 microns.
What does 753 on a gold watch mean
The 7 in this case would be a modifier in this case this would mean .0000001
"k", in this case, may mean "kilo", that is, "times thousand".
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