Back in the day, it was only the indices of a watch and not the numerals that were created with a luminescent material. Thus, when in darkness and trying to determine the exact time, it was easy to be off by an hour or so. It was important for the twelve o’clock indicator to be marked differently so that it was clearly distinguishable, which was accomplished with two dots next to the upward facing triangular index. Not only did this design facilitate pilots in determining the upward orientation of the dial, it also helped them quickly and easily determine the twelve o’clock position in relation to the rest of the indices on the dial of the watch. Today, the feature has carried over into the design of countless pilot’s watches. So the next time you see this design on a pilot’s watch, you’ll know all about its history and its overall purpose.
The triangle on position 12 o'clock is the distinctive mark of a Flieger watch. It is not known why this mark has been used. Originally it was used on the German B-watches, later also for Flieger watch models worldwide. Probably is was introduced for a better clearness of display and belongs today - often amended by the two points on the right and on the left - to the typical mark of this watch type. Frequently it is the only evidence for a Flieger watch.
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