| Heading and notes: | Form number E.T. No. 1. Has standardised interim period heading with State name. | 
| Message area: | 30 boxes in 6 rows of 5. | 
| Reverse side: | Blank. | 
| Colours (text & form): | Red on buff. | 
| Size of form overall: | 143 × 223 mm. | 
|  Provenance: Dave Elsmore. | SI-DO-3. Rialto, Melbourne to Telegraphs Adelaide. Characteristics: 
 | 
Details of use and rarity.
| Form sub-number | Schedule number | Earliest recorded date | Rarity rating | 
| DO-3 | None. | 6 April 1908 at Telegraphs Adelaide. | RR |