- Posts
- 61
- Likes
- 27
Goseki
·Wanted to share. My NTTD Seamaster was running perfectly, 0 to +.5 spd when suddenly it started losing time in all positions. Nothing too bad, about -.5 to -1 spd for months. For the last few weeks, it's been more erratic, going from +4 spd to -1 spd despite the same pattern of use, 12 hrs on the wrist, 12 hrs resting in the same position every night. I suspected magnetism as I did want to try out the METAS certification and see if my watch could resist magnets and did slap a strong magnet against the watch a few times, but reading online, most people said magnetism would result in the watch running fast.
To test, I tried different phone apps to detect magnetism. Overall they were all a bit iffy since it would sometimes detect magnetism and other times not. Finally gave in and tried one of those Amazon blue box demagnetiser and compass to test. Immediately the compass needle went nuts deflecting nearly 90 degrees as I waved my watch over it.
For the demagnetising, after reading all the online variations of how to do it along with the manual, I settled on putting a thick micro fiber cloth over the box folded to about 5mm thickness, then placing my watch on it face up after pulling the crown out to hack the movement. I turned on the demagnetiser, waited for the buzz and light to be on for a second or two, then raised the watch straight up slowly over 5 seconds by holding on to the bracelet. I then flipped the watch over and did it again. After the two passes, I waved the watch over the compass, and nothing! Same with the phone app, no more magnetic field detected.
Checked the watch accuracy and it's back to near exactly how I first received it. Gains 1-2 seconds flat, loses 1 second on the 3 and 9 up positions, about neutral at 12 and 6 up.
I was hesitant on doing this since it seemed like most sources I read suggested that a magnetised watch should run fast not slow, plus it seemed like it would be easy to magnetise the watch if don't incorrectly. But after fixing it so easily, would highly recommend or at least get a cheap compass to check the magnetism over the phone apps.
To test, I tried different phone apps to detect magnetism. Overall they were all a bit iffy since it would sometimes detect magnetism and other times not. Finally gave in and tried one of those Amazon blue box demagnetiser and compass to test. Immediately the compass needle went nuts deflecting nearly 90 degrees as I waved my watch over it.
For the demagnetising, after reading all the online variations of how to do it along with the manual, I settled on putting a thick micro fiber cloth over the box folded to about 5mm thickness, then placing my watch on it face up after pulling the crown out to hack the movement. I turned on the demagnetiser, waited for the buzz and light to be on for a second or two, then raised the watch straight up slowly over 5 seconds by holding on to the bracelet. I then flipped the watch over and did it again. After the two passes, I waved the watch over the compass, and nothing! Same with the phone app, no more magnetic field detected.
Checked the watch accuracy and it's back to near exactly how I first received it. Gains 1-2 seconds flat, loses 1 second on the 3 and 9 up positions, about neutral at 12 and 6 up.
I was hesitant on doing this since it seemed like most sources I read suggested that a magnetised watch should run fast not slow, plus it seemed like it would be easy to magnetise the watch if don't incorrectly. But after fixing it so easily, would highly recommend or at least get a cheap compass to check the magnetism over the phone apps.
