No problem hope you can get it running.
I only mentioned price because since it’s a chronograph, if it was $200 retail for example, that would be a tale tale sign of it being a quartz movement and simply needing a new battery.
If it is mechanical it sounds like the lubricant inside has dried up, or possibly dropped at some point. Though from what I understand it would take over a year to dry up if it hasn’t been wound up In that time.
Rule of thumb is to get a service at least every 5 years, and to wind it up at least once or twice a year. If it goes in water, especially on dives, it should be checked at least once a year. (Though I’ve heard stories of watches not being serviced in over 10 years running fine but probably not recommended)
Glycine Combat Sub