Overwinding a mechanical watch

I recently inherited a manual wind watch (non-IWC) and have been doing research regarding manual wind watches. The watch is an Omega Seamaster (caliber 861) circa the 1970s. I've read that manual wind watches should be wound to the "point of resistance," but after winding the watch for the first time, I have not felt any such resistance, even after 20+ rotations. I have read that this can mean the mainspring is broken, but the odd thing is, the watch continues to run normally. In fear of damaging the watch (apparently it is a very famous movement), I am hesitant to run the watch.

Has anybody had a similar experience with a manual wind movement (IWC or non-IWC)?

Thanks in advance for any answers.

Frank

Hi Frank
The 861 is indeed a famous movement as it powered the Speedmaster Moonwatch.
It has a power reserve of 48 hours and requires min 40 to 50 rotations to wind. It is very smooth and gives little warning when approaching full tension. Don't worry, I have wound mine to full stop many times with no harm, as long as it's not forced. It is a very robust movement.

I think if the mainspring were broken you would hear a sudden CLICK while winding and the watch would only run for a few hours. Congratulations, you have received a very nice and highly regarded chronograph.