Yes, enough to clean the dirt out completely and put the proper lubricants in the right places in the correct amount.
Not necessarily. Only if it's in bad shape.
Gaskets - unless otherwise specified. For instance, Steve serviced my '63 168.005 but I told him to leave the original yellow gasket in if it was in good shape. I'm not concerned with water resistance on that watch so much and it was in good enough shape to leave it. If a gasket, or any other normal wear item is replaced I expect the original back. If it's already got a replacement gasket or part, then returning that part isn't necessary.
This is kind of a waste of time & effort for any dress watch or vintage watch. For a modern dive watch though it's essential.
What exactly is 'factory specs'? I would think that most watchmakers give you a little better than factory specifications on timing, unless you're dealing with a true high end piece.
Not fully cleaning the entire movement, not using the correct oils or forgoing things like Epilame, being careless or sloppy and bending the hairspring or partially damaging a part that isn't in plain view or easy for a novice to see…..
Checking it means opening up and taking apart the watch and of course knowing what the hell you're doing yourself - which probably means you should be servicing your own watches. You can use a loupe to see if the correct amount of oil is surrounding an arbor pivot by looking for a dark ring of oil on the inside part of the donut jewel.
Click to expand...