OK…I think this is a GQ.
Last week, the SO received as change at the post office here not the expected Sackie, but a British Twopence coin! She tried to convince them it had come from their machine, but no one there would believe her. She also tried putting the coin into the machine, to see if it would accept it, and it did not.
Well - this seemed odd, until I just received an e-mail from a work acquaintence locally, who also received a British Twopence coin instead of a Sackie - also from a USPS stamp machine!
Comparing the two coins - it seems they are very close in size, but not that close. They are also close in weight, but not that close either, IMO.
So, my GQ is - is this a fluke, or has this been in the news that anyone has heard? I have searched, but not found any reports myself.