"14K psco" typically indicates that an item is made of 14 karat gold. PSCO likely refers to the manufacturer or designer of the piece.
10K refers to the gold content of the ring and in this case, 10 karat gold. PSCO refers to Plainville Stock Company in Plainville, Massachusetts (MA); website: http://www.plainvillestock.com/whois.html
It stands for "Plainville Stock Company"
"10k" on a ring means that the ring is made of 10 karat gold. "psco" is likely the manufacturer's mark or the brand name of the jewelry manufacturer. It is common for jewelry to have markings indicating the metal purity and manufacturer.
10K refers to the gold content of the ring and in this case, 10 karat gold. PSCO refers to Plainville Stock Company in Plainville, Massachusetts (MA); website: http://www.plainvillestock.com/whois.html
10 carat gold made by plainville stock company.
PSCO jewelry mark is from Plainsville Stock Co., still operating in Plainsville Ma. I found 2 sources; one stated that it was established in 1886 and the other stated 1874. I hope that this helps.
10k psco-p likely stands for "10 karat gold, Plumb Silver Company, plated". It indicates that the ring is made of 10 karat gold with a plating from the Plumb Silver Company. Be cautious as plated jewelry may wear off over time.
PSCO is the hallmark of the Plainville Stock Company, making jewelry pieces since the late 1800s. If it's marked 10K, it's that purity of real gold. You may have a valuable vintage piece of "costume" jewelry depending on its style and condition.
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