This monogram was first created by the heraldic artist J. Gordon Smith, in his book Monograms in Three & Four Letters (1903), London, England. 

Monogram: JBT

Accents/Accessories: Square shape; Detailed border; Detachable twisted bail; Smooth background

Size: 47 x 60 millimeters (1.85 x 2.36 inches)

Weight: 50.50 grams (1.78 ounces)