6a/6b mule -
Edward I (1272-1307), Penny, class 6a1/6b mule, London, double-barred N in DON, 1.34g/9h (SCBI North –; N 1030/1031; S 1401/1402). Rare; the combination not represented in the North Collection. From the North Yorkshire Moors Collection of Marvin Lessen, auctioned by DNW in 2018-20. Provenance: F. Elmore Jones Collection, Part II, Glendining Auction, 10 April 1984, lot 1564.