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Purely a marketing thing by Bucherer to get, mostly, foreign tourists to take home a Rolex with them.
It is like a percentage sign % but with two zeros below the line indicating that the ratio is per thousand, rather than per hundred used for percentages.
To ensure that items pass assay, the alloy used by the goldsmith will be slightly finer than the absolute minimum standard.
This is not shown by the hallmark, which records only that the item passed assay and was therefore of at least the required fineness.
No, we cannot stir silver nitrate solution with a copper spoon because , copper is more reactive than silver.
Thus,it would displace silver from the silver nitrate solution forming copper nitrate.... "Born with a silver spoon in his mouth." I don't know if a silver foot in ones mouth is a good thing or a bad thing.