50 Pence Postal Order; British Field Post Office, Alberta

British Forces Postal Orders — colloquially "BFPOs" — have circulated among UK military personnel stationed abroad since the Second World War, functioning as a controlled remittance instrument rather than a conventional postal order. Personnel at Canadian Forces Base Suffield in Alberta, where British troops train under the long-standing BATUS agreement, would have used this through the embedded British Field Post Office.

De La Rue's watermark security on these is notably modest relative to contemporary civilian postal instruments — deliberate, given the controlled distribution environment and the assumption that field conditions limit sophisticated verification.