As a child I was walking down the street and kicked something by chance that sounded metallic. 150 year old coin, irrc. Just there on the asphalt next to the sidewalk.
Unfortunately bronze, with trimmed edges, common mint and worth very little. But if you tell me someone just stumbles onto and old coin in the street just lime that, I pretty much believe it.
> if you tell me someone just stumbles onto and old coin...
I found a bill from the Weimar hyperinflation era. Its face value was several billion (Milliarden). Its only value was as a curiosity.
I took my kids to one of those gaming centers (skee ball, claw machines, etc.) and stumbled across a 19th century 50-cent piece in the change machine. It apparently is worth about $150 last time I checked.
The oldest coin in my collection is an 1838 large cent, which my dad says he found as a kid in a crack in the sidewalk. He was born more than 100 years after that date.
When I was a teenager I was working at McDonalds and someone came in and paid for a meal using old US Silver Certificate bills. Some people just are careless and don't notice old or unusual things.