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 to 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.