I once had a quarts digital watch.
After pulling to bits out of curiosity and putting it back together, the numbers were like an alien alphabet, they weren't numbers at all.
Rather than dismantle it and try to fix it, I could still see that the second digits were changing once a second, and the minutes once a minute, so knew it was just the digits garbled.
So I worked out what garbled number meant really, and once I knew that I could read the time, so I kept it and wore it for years.
I could tell the time as fast as reading a normal digital watch, it was fun when someone asked me for the time and I showed it to them