The Guernsey Pound is the official currency of the Bailiwick of Guernsey, abbreviated as GGP in forex markets. It is pegged at par to the British pound sterling and is issued by the States of Guernsey.
Example
“While the Guernsey Pound trades at par with GBP, banknotes issued in Guernsey must be exchanged at a bank when used outside the island as they are not widely accepted elsewhere.”