This center wheel from a 12 size #Elgin   #pocketwatch  shows the reason it's not a good a idea to run a watch without proper service to clean and change the lubrication.   The upper pivot on the center wheel is very badly grooved - all cut away on the side.  This happens because of grit in the pivot slowly wearing away at this part as it rotates once every hour for who knows how long.  Eventually this would stop the watch.

I think about this every time I read about a watch "runs just fine."  I'm sure this one ran just fine too.  But now this part has to be replaced.

Job number 130115...
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Elgin 24178549
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