Australia - International - OTC.
Ordinary rate delivery envelope: IAO-EO-6.

General characteristics:

Heading and notes: No form number.
No heading.
Message area: Window.
Reverse side: Blank.
Colours (text & envelope): White paper.
Size of envelope overall: 90 × 146 mm.
Distinctive characteristics of this form:

Unused window deliver envelope.

IAO-EO-06 rev IAO-EO-6 (reverse).

Reverse side of the above delivery envelope.

Shows typical OTC flap with rounded peak and straight sides.

Details of use and rarity.

Schedule number Earliest recorded date Rarity rating
EO-6 None   NC