not a clue
Half of 880= 880/2= 440
Silver marked 728 typically indicates a silver content of 72.8%, which is lower than the standard for sterling silver (92.5%). The value of such silver depends on its weight, current market prices for silver, and demand for lower-purity silver items. It's best to check with a jeweler or appraiser for an accurate valuation based on these factors.
900
0.5
110
"760" marked on any silver means that the object contains 76% silver (and 24% other metals).
99 on silver means 99% (or more) silver, or pure silver. Sterling silver is marked 925 (or 92.5%).
No. Jewelry stamped 925, .925 or "sterling" is genuine sterling, not silverplate.
925 = silver, gold color = gold plating
"966 sterling" does not have a standard meaning in relation to silver or sterling silver. Typically, sterling silver is marked with "925" to indicate its purity level of 92.5% silver. If you have a piece marked as "966 sterling," it may be a manufacturer's unique stamp or a mis-marking.
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If it's .550, not just 550 it is referring to the percent (.550x100=55%) of silver the product is made from.
This means that the item is 80% silver and 20% alloy. Sterling silver is 92.5% Silver and 7.5% alloy. Many silver items produced in Mexico are marked 800 or 80.0.
I don't know, but I have what looks like a very old sterling silver pin. It is only marked SGW. Wish I knew!
928 is likely the purity of the silver that the piece contains in parts per thousand. Most American silver is marked 925, German silver 800 or 830, etc.
Sterling silver is marked .925; fine silver is marked .999. It appears 3645 may be a pattern or product number.
Silver is marked on the 25th year of marriage.