Here is a sweet Art Deco gold signet class ring. The classic Art Deco design depicts an A on the shoulders that meet the rectangle plate for the monogram.

This can be a wonderful woman's pinky ring or a childs signet ring. The ring has recently been refinished. 
Dimensions: 7.1 x 10 mm rectangle face / 7.1 - 1.7 mm wide
Size: 4.5 (inquire for sizings)
Metal: 10k yellow gold
Markings: A on the shoulders / OB 10K for *Ostby & Barton & Co.
Circa: 1920's
Weight: 1.2 grams
Condition Rating: 7 (has recently been polished)

*Ostby & Barton & Co. a jewelry manufacturer from Providence dating from 1880-1950's. Tragedy befell on this company in 1912 when Englehart Ostby went down with the Titanic.