That has a London Pmk , Duplex 89,
Earliest Known use 1872
The Cyprus Penny
http://www.philokypros.net/CyprusDi...rusPennyRed/I am not aware of how the overprints were carried out, your CYPRUS differs markedly with the C, Y, and S from the stamp shown in that link.
Here is an Overprint from my collection, from a 2.5 penny that has suffered drastic light damage.
You can use it to compare your overprint.
