21-23 (32-34) 1896 2½a on 1a plum Q Victoria stamp of India with "Zanzibar" overprint surcharged in red, SG surcharges Type 3-5 (Scott Type a-c) cplt (3), undercatalogued,scarce, especially SG Type 4 (Scott Type b) as it occurred only 10 times in the original setting of 60.
