| Heading and notes: | Form number T.G. 56a. COMMONWEALTH OF AUSTRALIA above POSTMASTER-GENERAL'S DEPARTMENT. |
| Message area: | Blank. |
| Reverse side: | Blank with a 14 mm strip of adhesive. |
| Colours (text & form): | Black on light cream. |
| Size of form overall: | see below. |
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AA-ADG-13B.
Used on a Wattle Greetings window envelope (AA-GGE-2) on 27 September 1963. Characteristics:
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![]() Printed in January 1959. |
AA-ADG-13C.
Used on an INTERNATIONAL OTC window envelope (IAO-EO-5A) on 24 June 1971. Characteristics:
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![]() Printed in 1971. |
AA-ADG-13D.
Used on an INTERNATIONAL OTC window envelope (IAO-EO-5A) on 13 July 1972. Characteristics:
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Details of use and rarity.
| Form sub-number |
Schedule number | Earliest recorded date | Rarity rating |
| ADG-13A | None | RR | |
| ADG-13B | None | 27 September 1963. | RR |
| ADG-13C | O/N.C.2065. - 1/59 | 24 June 1971. | RR |
| ADG-13D | QTN. C. 810/71 | 13 July 1972. | RR |