This is a wonderful example of a Cape of Good Hope 1863-64 SG 19, the 4 Pence Deep Blue. 

This one has full margins.  It's close on the lower left, but still clear.  It is Mint Very Fine Condition with Original Gum.  As you can see from the photos it is a spectacular stamp, and the triangle design gives it a more unique and distinguished aesthetic.  It is valued at L300+ in the Stanley Gibbons Catalog.

This item is over $100 USD so I will ship it using priority mail in the US, and registered mail overseas.  This is is to ensure that it reaches you in a safe and timely manner, and includes tracking!