It is a very valuable watch as it is an early Daytona in very good condition. With papers it is for sure above 50k usd. As I am not really into these early pump pusher chronos I can't say if it is 50 or 100 or even more but I can tell you it is a lot. I would suggest that you contact ie Phillips Watches (watches@phillips.com) or a couple of high end dealers for a proper valuation.
Great watch by the way. Rare to see them with a nice dial with all lume intact, with correct hands and with the original steel bezel. Just a lovely watch.
If you decide to service and wear it.. Make sure you use a good watch maker which will respect the original parts during service. If handed to a Rolex Service Center you risk them to change the rare valuable parts and then we will all cry together with you as the watch will lose much of its charm and value.