Smallsword, known as a Mourning Sword, ca. 1790
British,
Steel; L. 38 in. (96.5 cm); L. of blade 30 3/4 in. (78.1 cm); greatest W. of blade 11/16 in. (1.8 cm); greatest thickness of blade 3/8 in. (0.9 cm); Wt. 15 oz. (425 g)
The Metropolitan Museum of Art, New York, Gift of Jean Jacques Reubell, in memory of his mother, Julia C. Coster, and of his wife, Adeline E. Post, both of New York City, 1926 (26.145.307)
http://www.metmuseum.org/Collections/search-the-collections/32387
Example from the MET New York, Described as mourning sword.