In this case it doesn’t matter if the watch is fully wound or not. The 7750 only winds with the rotor moving in one direction, and in the other it has no winding, so should spin freely. The fact it is jammed up means it needs to be looked at.
My SWAG (scientific wild ass guess, if you are not familiar with the acronym) is that there is a screw that has backed out of the automatic winding bridge, and is catching on the underside of the rotor.
Cheers, Al
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