This is a pair of 1890 British Guiana Stamps, SG 210 & 210b, the ONE CENT RED OVERPRINTS on 4 DOLLARS Green on cover.  One of them has a LARGE 4.  This cover was used in Georgetown on 11/14/1890.

These and the cover are in Very Fine condition.  On cover, these are valued at L16.50 x 5 = 300

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!