Just providing some feedback I've got 4 x Clean SH4131 movements and they all operate around -4 to +3 seconds per day. Amplitude is between 270-300
One of them was magnetised but I demagnetised it now and its also running perfectly.
The only thing is that I noticed moreso on the SH4131 is that when you wind the watch from zero power its smooth, as the spring gets wound it gets rougher and rougher to wind and when it hits max its pretty rough feeling. Probably just down to the resistance and the protection mechanism to stop you from overwinding it.
Other than that I think the SH4131 and the DD3141 are pretty much on par for stability, accuracy and reliability.
One of them was magnetised but I demagnetised it now and its also running perfectly.
The only thing is that I noticed moreso on the SH4131 is that when you wind the watch from zero power its smooth, as the spring gets wound it gets rougher and rougher to wind and when it hits max its pretty rough feeling. Probably just down to the resistance and the protection mechanism to stop you from overwinding it.
Other than that I think the SH4131 and the DD3141 are pretty much on par for stability, accuracy and reliability.
