The vintage women's watch ring "Seagull" was made in the 90s. The watch ring is an AUTHENTIC design, not re-made from a vintage wristwatch, as I can see some sellers doing there. The authentic ring watch was ONLY an oval case and had only one name "Chaika"\"Seagull" !!!
I offer a pre-owned ring, with some imperfections on the backside ring (please zoom photos). Mechanical movement, manual winding, 17 jewels. The watch is in full working order and professionally serviced. 

Case wide: 0,6” (1,5 cm)
Case long: 0,7” (2 cm)
The ring inside diameter is about 53.8 mm\2.116 inch, which would be US, Canada, and Asia size 6 3/4 or the UK, 

and Australia size N

I'm following this link to determine the size of the ring:
simonewalsh.com/pages/ring-size-conversion-chart