Australia Post...Signs of Congestion My latest email.
Your item has been delayed
We apologise for the holdup.
Delivery was expected by Thursday 13 Oct 2022, but unexpected congestion in our network means your item will take a little longer to arrive. We'll deliver it as quickly as we can and will let you know when the postie has it on board for delivery.
If it hasn't arrived by Monday 31 Oct 2022, please get in touch and we'll find out what's happened.
I would say very definitely a join pair. I can't see anyone casually sticking two individual stamps on an envelope and matching the horizontal perfs, let some the vertical perf along the selvage.
Re the horizontal coil perf, one could say that the intent was to prevent unwanted separation on stamps,given that there is more paper between the holes. My experience is that these stamps can easily separate particularly if they been folded.