Edward VI Sixpence, third period, fine silver issue, mint mark tun

Edward VI (1547-53),fine silver Sixpence, third period (1551-53), facing crowned bust, rose to left, value to right, initial mark tun, linear and beaded circles with large letter legend surrounding, EDWARD: VI: D; G; AGL; FRA; Z: hIB; REX:,rev.long cross fourchée over quartered shield of arms, smaller letter legend, POSVI DEV; A DIVTOR E; mEV;, weight 2.84g (N.1938; S.2483).Dark tone, weak in parts though with a charming portrait, practically very fine.