Most people are aware of how rare 10mm sockets are, they go missing almost immediately.
My story is different. When I was 16, (1973), I got a Wright metric socket set; the 10mm socket went rogue a couple of weeks later. Then, some time down the road the whole kit was stolen along with a bunch of other tools from my shop. When the day finally came that I had to relocate from the old barn to my Dad's boat shed (which had been my long-time shop until 3 months ago), Lo and Behold! There was the 10mm socket, deep under the workbench base.
Now, more recently, I'd say 1995 or so, I bought a large Craftsman socket & wrench set. Sure enough, the 10mm socket went spare within mere months. To bring this story to a happy conclusion, you might guess by now that the 1973 Wright 10mm socket sits proudly (literally, it's taller than the others) in my Craftsman kit.
That's only 46 years, but it's something...