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These posts bring up an interesting thought. There is a misconception that when something is designed a bunch of engineers pull out complex math formulas , the products are made from these and then shipped out the door. This is not the way things are really done. That is the reason airplane factories have wind tunnels, testing facilities and test pilots. When that watch was designed and manufactured the watch company went through the same process in selecting the mainspring that Paul went through. This means that the watch will work properly within a certain range of selections and the replacement does not have to be an exact match to the origional. As long as the selection makes the watch work within certain performace parameters, it is an acceptable choice.
david