PL. 57(SG40) BLOCK OF FOUR ON COVER(BJ BK CK CL) LOWESTOFT TO DERBY. 1863 envelope Lowestoft to Derby with good used block of four 1d pl. 57 rose-red on white paper (SG40) lettered BJ BK CK CL, a little off centre but fine perforations and tied LOWESTOFT/478 duplex's SP 19 63. BJ shows constant variety MINOR RE-ENTRY. (Ref 67104).