What size is a pound one asked!
Well it started about 100 X 50 mm X thin (.05mm ish)
It got smaller and smaller by size and changed material to brass, now it is a little washer before the hole is punched, the two pound one is a washer with a plug in the middle to fill the hole.
As inflation continues the hole will fall out.

In fact it is now over a pound to purchase a penny washer, and we had 320 in the old pound, I think.

The value is so small (when I was a boy I could purchase 20 pints of beer for one pound) but always had change from a pound as I fell over around the tenth pint.
Now one pound does not even get one a half pint of lemonade without the lemon.
I would post pictures of the pound to compare sizes but I cannot find one even though I put 20 in my pocket!

Ps I have evidence to show that my Grandfather purchased a house for just ten of them, but they wassss Biggg then. pounds that is!
Happy New Year to all you good folk
Trev