| Image2 | |
| Cat Number | 531 |
| Description | Abacus, Numerals, Computer Circuit |
| Denomination | 7c |
| Perforation | |
| Date Issued | 1972-10-16 |
| Variety | |
| Series | |
| Color | multi |
| Year | 1972 |
| Type | Commemorative |
| Image1 | |
| Ebaylink | https://www.ebay.com/sch/i.html?_from=R40&_nkw=Australia+stamp+531&_sacat=0&rt=nc&LH_Sold=1&LH_Complete=615 |
| ID | 615 |
| Sorter | 615 |