1851 LINCOLNSHIRE/REGISTERED MAIL. Envelope Spilsby to Macclesfield (Brocklehurst bank correspondence) with 1d imperf (SG 8) lettered HG and strip of 3 2d blue plate 4 lettered RI RJ and RK (all cut into and affected by filing fold) tied '728' numerals of Spilsby. Backstamped SPILSBY NO 15 1851. Stamps paying 1d postage and 6d registration. Unusual provincial registered usage. (Ref 62625).