My nan found my Grandads old watch, It used to sit in the van in this state (He was a builder) and I remember shaking it and setting the time as a kid.
It belonged to his brother, And had been in a wooden chest for 20 years!
I decided to surprise my uncle and have a go at fixing it up! It still worked but I completely refurbed it as best I could. Had never done anything to a watch before bar a battery/Strap change.
Stripped down everything bar the actual movement, New glass ect. Took an age to polish those dings out!
(I am an engineer by trade so have the mentality for it, Not saying I am a good engineer mind lol)