Thailand. (Great Britain). 1941. Air Mail envelope headed 'Penwortham Mills/ Preston' addressed to Bangkok, Thailand bearing Great Britain SG 470, 6d purple and SG 473, 9d olive tied by Preston double ring '20th Nov 1941' with 'Opened by Examiner/ 6261' censor label and framed instructional 'No Service/ Return to Sender' on face. Scarce item of Interrupted mail which could not be sent via the Pacific due to the attack on Pearl Harbour 7th Dec'.