| Heading and notes: | Form number E.T. No. 45. Standard interim period heading. Date stamp box in heading section. |
| Message area: | Heading line with 7 lines for message. Has two lines of vertical text at the left which finish just below the top section. |
| Reverse side: | Blank. |
| Colours (text & form): | Black on pink. |
| Size of form overall: | 167 × 207 mm. |
| Size of datestamp box: | 38 × 35 mm. |
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WI-DU-4.
Big Bell to Geraldton. Characteristics:
Only recorded form of this type. |
Details of use and rarity.
| Form sub-number |
Schedule number | Earliest recorded date | Rarity rating |
| DU-4 | None. | 11 August 1939 at Geraldton, WA. | RRRR |