This stamp of Bartolomé Masó is on the back of a Cuban postcard in my miscellaneous collection. Every once in awhile if I see a stamp I really like I’ll get the card, and I think South American stamps are the prettiest.
Bartolomé Masó was a president in Cuba starting in 1897. There is surprisingly little information that I was able to find on him considering he was a president. If politics and government interest you, you can read about Masó here.