Something that is interesting: Today it is often easier to find higher valued multi-jeweled movements than it is to find well running good examples like your grandfather's watch! Treasure it as it is a treasure.This watch belonged to my grandfather, a German citizen who emigrated to Brazil in the beginning of 20th century. As a typographer, he couldn´t buy a more elaborated piece. I received it some years ago and, luckily, found a place where it was serviced. And is working very well!
For me, is a piece of family story.
Thanks for the information!