Unknown Maker, ‘Rowel Spur’, ca. 1400, The Metropolitan Museum of Art

French or Spanish, Catalonia; L. 7 1/4 in. (18.42 cm); L. of neck, 3 in. (7.62 cm); Diam. of rowel, 2 7/8 in. (7.03 cm); Wt. 7 oz. (198.45 g)
http://www.metmuseum.org/art/collection/search/22405

Image rights: The Metropolitan Museum of Art (Gift of William H. Riggs, 1913), licensed under CC0 1.0 Universal