This ring is very likely a European (especially German/Scandinavian) vintage piece from the late 1930s to the early 1950s (late pre-war to immediately post-war). Evidence: ① Hallmark "835" **835 silver (83.5%)** was the standard in Germany, Austria, and Northern Europe. The peak usage period was from the early 1900s to the 1950s. After the 1960s, there was a rapid shift to 925. → New items with the 835 hallmark are hardly made anymore. In other words, > "The 835 hallmark is clearly stamped" = High probability of being from before immediately after the war. ② Signet ring + monogram engraving Personal monograms (initial decorations) are typical of pre-war European male culture. The "personal initial culture" rapidly declined after the war. ③ Stone (emerald green) Judging from the color and transparency, the possibility of a natural emerald is low. It was common at the time to use: Green glass Synthetic spinel Green agate Any of these is likely ※ This perfectly matches the era. ④ Craftsmanship Thickness of the bezel (stone setting) Organic carving on the shoulders Slight distortion that is not perfectly symmetrical These are characteristics of casting + hand finishing from the pre-war to early post-war period. Era Summary Item Judgment Production Era: Around 1935-1950 Region: German/Scandinavian Material: 835 silver + synthetic/semi-precious stone Classification: Authentic vintage In the collector's market, **"Pre-war European signet ring × 835"** has a stable demand. A classic silver ring with green engraving. - Material: Silver 835 - Stone Color: Green (emerald-like color) Approximately size 17 (Japanese ring size) Casablanca source material? ※ As it is vintage, there are slight cracks in the stone. There is no problem with wearing it. Please note that the above is just an amateur opinion. Thank you for viewing.