| Heading and notes: | Form number 66a or 66A. Heading is TELEGRAM DELIVERY ADVICE. | 
| Message area: | Lined. | 
| Reverse side: | Blank. | 
| Colours (text & form): | Black on cream. | 
| Size of form overall: | 101 × 165 mm. | 
|  Printed in August 1955. | AB-AD-1A. Unused Telegram Delivery Advice form. Characteristics: 
 | 
|  Printed in 1966. | AB-AD-1B. Unused Telegram Delivery Advice form. Characteristics: 
 
 AD-1C is identical to AD-1B except the font for the form number is T.G. 66A and the schedule number has been moved to the lower left corner. | 
Details of use and rarity.
| Form sub-number | Schedule number | Earliest recorded date | Rarity rating | 
| AB-AD-1A | Sch. C. 7363 - 8/55 | NC | |
| AB-AD-1B | O/N. C. 3435/66 | NC | |
| AB-AD-1C | O/N C4254/72 | NC |