1937 (8 Sep) Imperial Bank of India registered commercial cover (280 x 120mm) from Rangoon to Wellington, NZ franked 33a (2r1a) representing Imperial letter 4½a (for 1-2oz.) + airmail surcharge 8½a per half ounce x 3 + 3a registration, backstamped Darwin, TPO 2 South NSW, Sydney. Unusually high franking and origin/destination