Extremely rare and collectible Thornhill Mouse Bracelet depicting two mice, their tails coiled around the tubular hinged bracelet, their noses touching a central coral ball. 
Walter Thornhill and Company of Bond St. London were well known for their novelty jewellery and in the 1870s introduced a mouse parure of a registered design which by 1880 including earrings, bracelets, rings and brooches. (See last two pics above) 
English circa 1880
Weight - 15.5g
Internal circ - 6.4” 
High carat gold 
In excellent condition