Vintage wristwatch consistent with Rotary brand styling

This appears to be a vintage ladies' cocktail wristwatch featuring a small circular case and a gold-colored bracelet. The dial bears markings that appear to read 'ROTARY', '17 Jewels', and 'Incabloc', which is consistent with mid-20th-century watch production. The dial is white with black Roman numeral hour markers and two dark hands, showing significant yellowing, spotting, and general discoloration consistent with age and possible moisture ingress. The case and the stepped, H-link bracelet are gold-toned; a hallmark or maker's mark reading 'J.A.M' followed by numerical stamps (possibly '.375' or similar) is visible on the inner clasp, which may suggest a gold purity, though this remains unverified without physical testing. A delicate safety chain is attached to the clasp area. The piece shows overall wear including surface scratches and patina. While the markings suggest a Rotary manufacture, signatures and hallmarks can be replicated; therefore, its origin and composition are subjects for in-person expert verification.

Based on my visual analysis of the provided image, I have examined a vintage ladies' cocktail watch with markings indicating it is a 'Rotary' 17-jewel model. Based on what I can see, the piece features a gold-toned H-link bracelet and a case that bears stamps suggesting a possible gold purity of .375 (9k), though I cannot verify the metal content or the legitimacy of these hallmarks from a photograph alone. The dial shows significant spotting and discoloration, which typically suggests moisture ingress and may indicate the mechanical movement requires a full overhaul. My value estimate is based on the hypothesis that the watch is a mid-20th-century gold piece by the attributed maker. In the current secondary market, there is moderate demand for vintage gold cocktail watches, though condition issues such as the dial damage observed here generally suppress value compared to pristine examples. This estimate assumes the gold content is as marked; if the watch is found to be gold-plated or a base-metal reproduction 'in the style of' Rotary, the value would likely drop to a decorative range of $30–$60. To confirm these findings, a physical inspection by a specialist is necessary to test the gold purity, verify the movement's functionality, and ensure the hallmarks are not later additions or forgeries. Scientific testing of the metal and a closer look at the movement's caliber markings would be required for a formal identification. Consequently, this valuation serves as a preliminary guide only and is subject to change upon a hands-on technical assessment.