I’m surprised this stamp seller didn’t cover half the envelope in 5 cent stamps.

That’s what I usually get on the envelopes from stamp sellers: decades old stamps from the “bad investment” portions from stamp collectors.

I used to order fragrance samples on eBay, The first order I received from them had a 10 1/2 pence stamp attached. I was perplexed as the half pence (ha'penny, pronounced HAPE-KNEE) coin had been discontinued in 1984, 30 years ago at the time, and I'd only seen them in an old collection of coins from my parents. Also the portrait of the Queen (I'm from the UK) was a bit outdated.

I contacted the seller and it turned out her husband was a stamp collector and gave her his low value cast-offs to use as postage. I found it amazing that 30+ year old stamps were still valid. It's only recently they've become invalid postage as now stamps require a barcode.

Also I used to get items delivered to my office, and the office manager's husband was a stamp collector, so she used to ask to keep the stamps I got (I used to order electronic components from all over the world) so this completed the philatelist cycle.

Another old currency anecdote. I used to work on the checkouts at a supermarket in Cambridge circa 2009 and at least two times we'd get visiting academics from the USA who had studied in the UK years before and they'd try to pay with currency they'd had from the time, except it was the awesome old pre-decimal money (We switched to decimal in 1971). I found it quaint that they thought it was still valid and thought to bring it with them.