I inherited this 2436C two years ago when my father passed. I finally was able to have someone look at it. They said basically it needs a full cleaning, the past oil has turned to dust. New mainspring, timing and Chrono adjustments. It is an heirloom so I don’t want any buffing or polish, just service and replace needed parts. Was quoted $1250 for the job. Does this sound reasonable?

Here was a video I made before it stopped working.

A couple pictures as well.

 

Not the lowest price, but if it's an esteemed watchmaker I think it would be worth it for an heirloom like this.