I have 3 watches with 7750, obviously at least 2 of them, sometimes even all, rest on rotating watch winders.After 12 hrs rotating, I can hear click the mechanism preventing the spring from overwinding while winding manually more than 3-4 full additional turns, indicating the watch winder did it's job.
I drive my car almost exclusively left-handed and although working in an office, there I am quite active runnig around and doing all kinds of manual things, consequently I expect the automatic winding of my watch being slightly more than usual, nevertheless I feel that it mostly is not more than half wound. All 4 ETA's 2824-2892-2893(bi-directional winding !)I have come close to full winding under similar circumstances.
I like the 7750 however all 3 make an ugly noise while the rotor is turning idle.
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