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The nature of mechanics and physics mean that each part in a watch will perform its job correctly within a certain margin of error. Some of this is the mechanical tolerances, and some of it is the effect of unavoidable environmental factors (like temperature). Which means that even if you were able to regulate a watch to +0 in all positions, you'd still find that the accuracy drifting +/-.

You'll find that some movements are sold in different "grades". This grade reflects the design of the movement and the tolerances that the pieces are manufactured to. In theory, this will give the watch a smaller overall margin of error, and allow the watch to be regulated to a smaller number. But for a normal grade watch, it really isn't worth getting the rate closer then +/-5 seconds; the rate at any given instance will still be all over the place.
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