A pictorial postmarker was used to cancel 10,445 articles, including 20 registered, at the temporary post office provided at Sydney University between 16th and 25th August, 1976, for the 25th International Geological Congress.
Details
- Date: 16 August 1976 – 25 August 1976
- Quantity: 10,445 articles
- 10,425 (ordinary)
- 20 (registered)