This is a charity shop find and I traded a modern day tenner for it.
1930 Northern Bank £10 Note.
A quick internet search reveals this had a rough value of £580 adjusting for inflation.
Kind of mind boggling.
It’s huge too, I imagine so it wouldn’t be misplaced easily and perhaps as a statement to it’s value, the same way todays notes grow in size according to the value.
A mint £10 note sells for around £500 and a mint £100 note can fetch as much as £3500!