Earlier today (or should that be 'yesterday' now?) I finally got around to starting to clear some of the junk from my attic.
I started with a sports bag full of my football refereeing gear that I've not used for over a quarter of a century. As well as clothing, whistles, linesman's flags, notebooks, etc, I found about half a dozen old 10p pieces. (For a moment I wondered why they were there but then I remembered that there's not much more embarrassing for a ref than having to borrow a coin to toss up with, so I'd obviously made sure that I'd always have a coin handy).
Like you, I'd forgotten just how big they were!