used Block of Four OFFICIAL STAMPS: 1890 (1 April) "OFFICIAL" 17-17½mm. long, ½d. green used block of four, the upper left stamp with variety both "I"'s omitted; one stamp (not the variety) with small faults, otherwise fine. Scarce. B.P.A. Certificate (1994). S.G. O1c, #500+. Photo