I think I have found Danecraft-Felch's earliest trademark. Danecraft was part of Felch from 1934 to 1945. Danecraft Sterling FCO clearly belongs to the latter period because patriotic bangles (stars and bars) have this mark. This is the second bracelet I have found with a faint FCO between a curved Danecraft and Sterling. I would call the design ferns. 1/4" wide, 2 1/2" in diameter. 15 grams. I would date this to the 1930s. Excellent vintage condition.