Thailand. (Post Office Stationery). 1958. Official Mail registered envelope headed with vernacular hand-stamp in violet 'On Postal Service' addressed to Pha Nakhon with 'R/ Ayuthya' registration label and Garuda imprint on reverse.
Official mail from the Government Offices was posted unstamped with the name of the Ministry, the title and signature of the official. The mail was received in the Post Office and registered if required.