back in my day there used to be stamp vending machines. You put your 2 or 5c coin in and a single stamp would come out and you would have to detach it from the perforations
Back in my day the local post office was a tiny little cubicle with a slidey window (looked a bit like a confessional booth) that sat inside a wool shop. It was also run by my prep teacher so I sometimes got to see her on the school holidays.
Are you responsible enough with that stamp young friend?
I don't think so old friend. I had to google how the hell they worked and even now I'm essentially just guessing. It said it's $1.20 postage to Melbourne, so I think it'll arrive. In any case, I learnt through an eBay seller that Auspost don't just refuse to deliver if you don't put enough stamps on, they just make the recipient pay the difference, so I can't really mess up (I think)