'Canal Zone Postal Service' PENALTY envelope franked with 1939 ½c orange & irregular block of three 1½c brown 'CANAL ZONE' overprint issue (SG 165/66) tied by BALBOA HEIGHTS duplex cds's. Addressed to USA.
'Canal Zone Postal Service' PENALTY envelope franked with 1939 ½c orange & irregular block of three 1½c brown 'CANAL ZONE' overprint issue (SG 165/66) tied by BALBOA HEIGHTS duplex cds's. Addressed to USA.