Vintage Gold-Plated Folding Pocket Knife Pendant on Chain

This item is a vintage folding pocket knife, likely dating from the 1920s to the 1940s, designed to function as a piece of gentleman's jewelry or a watch chain fob. The handle scales feature an ornate engine-turned or guilloche engraving pattern with a decorative border and a central longitudinal panel, characteristic of the Art Deco period. The knife body appears to be constructed of gold-plated or gold-filled brass, exhibiting a soft yellow sheen with visible surface patina. It measures approximately 2 to 2.5 inches in length when closed. The single carbon steel blade is centrally pivoted and shows significant darkening and oxidation (patina), consistent with its age and material. The item is attached to a fine curb link chain that terminates in a mechanical swivel lobster-style clasp, typically used for securing such accessories to a vest or pocket. Condition is fair to good, with signs of consistent use; there is visible wear to the gold plating on high-contact points, and the blade surface shows pitting. No manufacturer stamps are clearly visible in the provided image, but the craftsmanship suggests a mass-produced yet high-quality accessory from an established jeweler or cutlery firm of the mid-20th century.

Based on my visual examination of this vintage folding pocket knife pendant, I have assessed the item as an authentic piece of mid-century gentleman's accessory jewelry, likely produced between 1925 and 1945. The engine-turned Art Deco engraving is characteristic of gold-filled pieces from this era. The condition is fair, showing significant oxidation on the carbon steel blade and notable wear to the gold plating—specifically on the bolsters and edges—which indicates frequent use and impacts the overall market value. In the current secondary market for 'watch fobs' and 'gentleman’s curios,' there is steady demand for functional Art Deco items; however, the lack of a visible maker's mark (such as Simmons or W&H Co) and the surface pitting on the blade limit its appeal to high-end collectors. Comparable sales for unsigned gold-filled knife fobs in this condition typically range from $40 to $80. Key value drivers include the intact swivel clasp and the classic geometric aesthetic. Limitations of this appraisal include the inability to verify the gold content via acid testing or to check the 'snap' and tension of the blade’s spring mechanism. A physical inspection is required to confirm if the scales are gold-filled or merely thin electroplate. Provenance documentation regarding the original owner or the manufacturer's hallmark would be necessary to reach a premium valuation.