I'm new on this forum, and looking for some advice. I have a Autavia Heuer 11630P divers watch (with decompression bezel)(model from 78 i think. After 25 years it .....something inside snapped/broke. What would be the value of this watch now?

Welcome aboard . . . thanks for posting your message. These 11630P chronographs are rare, and the nice ones carry a relatively high price. It is difficult to provide any estimate of the value, without seeing some photos. If I had to provide a rough estimate / broad range of values, for a 11630P chronograph that is working properly, I would say $1,500 to $3,500, depending on the mechanical and cosmetic condition.

For the repairs they are asking approx 300,- euro's

My suggestion is that, under almost any possible scenario, it would be well worth having this chronograph repaired. If it ran for 25 years, and has suddenly quit, that suggests that it is probably a relatively minor repair (or time for the long-overdue overhaul). The 300 euros sounds about right, for a cleaning, overhaul, etc. If the cosmetic condition is good, then this 300 euro investment will give you a chrono that will be worth many times that amount!

Thank you again for posting your message, and please keep us informed!!

Jeff