Japan. (Royal Air Force). 1947. Registered envelope addressed to Scotland bearing Great Britain SG 485, 1/2d green, SG 486, 1d pale scarlet and SG 490, 3d pale violet tied by 'RAF/ Post Japan/ 321' double ring with framed hand-struck 'R/ R.A.F.P.O. 3201 "Miho" on face in violet.
Lovely item of registered mail from RAF PO 321 based at Miho, Japan part of the British Commonwealth Occupation Force.
This is the example used by Ted Proud in the book "The Naval & R.A.F. Postal Services."