This is a Zanzibar Provisional SG 23i, issued in 1895-98. It has a 2 1/2 Type 3 IN BLACK on a 1 Anna Plum.
This one in particular has a smaller, raised second 'z' in ZANZIBAR. There is also a broken base to the 'b' in ZANZIBAR, which is UNLISTED! The 1/2 in 2 1/2 is also widely spaced! It is in Fine to Very Fine Mint Never Hinged Condition.
SG 23i is valued at L540 in the Stanley Gibbons Catalogue.
This item is over $100 USD so I will ship it using Priority Mail in the US, and Registered Mail Overseas. This is to ensure that it reaches you in a safe and timely manner, and includes tracking!