I bought this 1959 cover because of the unusually high franking. I've never seen an Australian predecimal cover with so many high value stamps before:
I took to this cover at once, because it was sent the very day I was born (11.3.59). I did not know this when I bought it, but as a result of this discovery it's now become my latest favourite possession!
Leaving aside the date on which the item was posted, there is a mystery surrounding this cover which I hope forum members may be able to help dispel.
The envelope apparently carried X-rays. (The inscription that is obscured by the 5 shilling and 10 shilling stamps on the left reads "X-Ray Films. With Care.") It was sent from "Locarno" at 141 Macquarie St., Sydney, which was the address of a medical practitioner.
The address of the recipient is unknown because the bulk of the envelope containing the X-rays was cut off and only the part with the stamps preserved. But the destination was somewhere overseas, as we can tell from the fact that the envelope features an Air Mail sticker.
What I find curious is that after the stamps on the right side of the envelope were cancelled at Royal Exchange, the package made its way to the GPO, where additional postage to the value of 2 pounds and 10 shillings (!) was added. The stamps were then cancelled.
Isn't it highly unusual (and mysterious) to see a cover indicating that stamps were added - and cancelled - at two different post offices on the same day?