Richard III (1483-1485), Groat, London, type 1, mm. halved sun and rose (no.1), nothing below bust, reads di, barred a in civitas, 2.98g/3h (Webb Ware 20 [obv. 3/rev. 51], this coin; Stewartby p.434, I; Winstanley 1; N 1679; S 2154). 

Provenance: North Yorkshire Moors Collection (Marvin Lessen), R. Sainthill Collection, Sotheby Auction, 27-9 April 1870, lot 244 (part); H. Webb Collection, Part I, Sotheby Auction, 9-14 July 1894, lot 206; R.C. Lockett Collection, Part II, Glendining Auction, 11-17 October 1956, lot 1657; SCMB November 1966 (H 3778).  Images courtesy of DNW.