Castro,
A movement cleaning, oiling, adjusting, crystal and strap is considered normal maintenance just like an oil change, brakes and wiper blades on a car.
Please don't take my words as meaning that you shouldn't do these things, they are necessary to make this "roadworthy".
I would save all the old parts as keepsakes, part of the "museum" exhibit!. They take up little room and will stoke fond memories every time you come across them.
Now, let's see that pocket watch!
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