"The marking ESPO or also found as ESPO-FLEX are the marks of Esposito Jewelry, Inc. a costume jewelry company located in Providence Rhode Island, USA. These marks were first used in 1951."
I cut and pasted the above answer from http://www.modernsilver.com/MYSTMARKS.html
espo was the company that made it. 925 means sterling silver.
Sterling stamped on any item is .925 silver and .075 other base metal.
if the number .925 is stamped on it also that means sterling silver if the number .999 is stamped on the ring that means it is pure silver if no numbers, i am not sure
The mark for sterling silver is 925 which indicates 92.5% silver content.
925 Argento is Italian for Sterling Silver. Most sterling silver pieces are stamped either 925 or sterling. Argento is Silver.
JSS stamped on a ring likely stands for "Sterling Silver" jewelry. Sterling Silver is an alloy containing 92.5% silver and 7.5% other metals, typically copper. This stamp indicates that the ring is made from genuine sterling silver.
Are you sure it is fspo? ESPO is the name of a vintage jewelry company. I see it on many gold filled rings.
"925" stamped on a ring refers to the purity of the metal, indicating that it is made of sterling silver. Sterling silver is 92.5% pure silver, with the remaining 7.5% typically being another metal, often copper, to provide strength and durability. So, "925" is a hallmark for sterling silver.
925 is the stamp for sterling silver.
It means it is sterling silver made in Taxco, Mexico
925 RCR stamped on sterling silver means that the item is made of 92.5% pure silver, which is the standard for sterling silver. The RCR likely stands for the manufacturer or designer of the piece.
99 on silver means 99% (or more) silver, or pure silver. Sterling silver is marked 925 (or 92.5%).