| Image2 | |
| Cat Number | 537 |
| Description | Early Morse key |
| Denomination | 60c |
| Perforation | |
| Date Issued | 1972-11-15 |
| Variety | vert |
| Series | |
| Color | multi |
| Year | 1972 |
| Type | Commemorative |
| Image1 | |
| Ebaylink | https://www.ebay.com/sch/i.html?_from=R40&_nkw=Australia+stamp+537&_sacat=0&rt=nc&LH_Sold=1&LH_Complete=621 |
| ID | 621 |
| Sorter | 621 |