Roman soldiers would frequently bury their coins before they went off to war. Many never returned or couldn’t remember where their 0% interest bank was. People with metal detectors find these stashes after 2,000 years of oxidation and sell them on E-Bay.
I bought a stash of these from Croatia, and am finding some gems down underneath all the dirt and rust.
One common design on the tail side, was very similar to that on the back of the 1959 British threepence.