Edward IV Ryal, Norwich, small output from a very rare mint

Edward IV, first reign (1461-70), gold "Rose" Ryal of ten shillings, light coinage (1465-70), Norwich Mint, King standing in ship holding sword and shield, mint letter n in waves below for Norwich, E on flag at stern, rose on hull, Latin legend and beaded borders surrounding, trefoil stops both sides, initial mark sun on reverse only (1465-66), ED WARD'. DI; GRA'. REX. AnGL'. Z FRnC'. DnS. I.B., rev. rose at centre on sunburst, over cross with floriate and lis terminals, crown over lion in each angle, all within beaded and linear tressure of eight arcs, fleurs in spandrels, beaded circle surrounding, stop between I and B, *IhC'. AVT'. TRAnSIEnS: PER: mEDIVm: ILLORVm. I.BAT, weight 7.48g (Schneider 422; N.1552; S.1956). Toned and design a little doubled in strike, reverse struck from a rusted die, short of flan with ingress at one part, hairline crack in flan with evidence of light filing on rim and onto reverse side, otherwise very fine and extremely rare.