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Considering that 90% of the general population use their right hand over link their left for a lot of other things link besides writing, even when the fountain pen gave way to the ballpoint, it still made more sense for righties to be lefties when it comes to wearing a watch. (There continued to be right-wrist watch wearers, of course; astronaut Michael Collins, Command Module pilot for link Apollo 11, was a southpaw, and always wore his watch on his right wrist).