This monogram was created by AA Turbayne, in his book Monograms & Ciphers, London, England, (1906). 

Monogram: FF W/CROWN

Accents/Accessories: Loose bail; Convex form; Oval shape; Smooth, mirrored finish; Smooth, rounded edging

Size: 40 x 22 millimeters (1.57 x 0.87 inches)

Weight: 5.40 grams (0.19 ounces)

Sterling Silver Chain as shown: 16 inches - $25.00 or 18 inches - $35.00