So there I was, randomly looking at my Archimede B-Type Pilot. In a flash it occurred to me that the "1" numerals in the hour circle are a different style than that used in the minutes (hour 1s are a straight line, minute 1s have an extra nub). All the other numerals appear to be the same for both.
It got me to thinking that there are often some details that, for whatever reason, we overlook at first. I was curious if anyone else would like to share some examples from their own experience.