Burma. 1941. Air Mail envelope addressed to Scotland bearing SG 22, 1a brown tied by Maymyo double ring '11th June 41' with framed instruction 'Insufficiently Paid For/Transmission by Air Mail' , underpaid with 'T' hand-stamp and horseshoe 'Maymyo/Due/As' on face. on face. This is the example recorded by Ted Proud in his excellent book on Burma.