Probably that it was # 766 of an 18k Design.
18k refers to the gold content (18k = 75% gold) with the rest being silver or other metals 159 refers to the purity of the silver
k
66.5
Just a pair of straight vertical lines, one on either side of the number. The absolute value of 18k is |18k| . The absolute value of 'x' is |x| .
What does rsc mean
ploro 18k
18KTGE and RSC: 18KTGE = 18 karat gold electroplated; RSC = jeweller's brand
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RSC inside the band of the ring, is the stamp for RS Covenant, a wholesale ring maker.
Right Subclavian
10 k
Probably that it was # 766 of an 18k Design.
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