Anyone got the Seiko SPB151J1...Willard??

[Gary Busey]

Originally Posted by Lol-x

I saw an online article about the 6R35 calibre movement.
It said to fully wind the power reserve one had to wind the crown a minimum of 55 times.

So I wound it 60 times yesterday and on the timegrapher it showed this today:

Attachment 1290671

But now an hour later the timegrapher is showing +8 seconds and 247 degrees and 0.2ms beat error.

So it seems this movement is all over the place, which makes it really hard to regulate. No wonder Seiko gave it a +25 to -15 seconds per day specification.

To seikos defence, they really “undersell/overdeliver” on accuracy numbers.
To me, from a movement standpoint Seiko gets interesting at the 8L level. You can get an amazing piece in the secondary market….for a great price. But the 6r35 is just a bit too flimsy…


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[Lol-x]

Just tested today on the timegrapher:
Dial up: 0+/- seconds per day, 280 degrees and 0.1ms beat error.
Dial down: +10 seconds per day, 274 degrees and 0.1ms beat error.

Strange as it may seem when I wound the watch 60 rotations, it seems to have changed (settled down) the movement from +10 seconds per day to 0 seconds per day (dial up).

I think that winding the watch 60 times has relaxed the main spring and the result is more accurate timekeeping. But how was I to know to wind the watch 60 times, there isn't anything in the instruction manual about that.... To me there is no other explanation how this can go overnight from +10 to +/- 0 seconds per day.

[Lol-x]

It seems that the readings from the timegrapher is somewhat meaningless.
The watch is gaining 10 seconds per day so the reading on the timegrapher of +/- zero seconds per day is misleading.

[saxo3]

Methodology is not correct. One needs to measure the rates and amplitudes in all positions (DU, DD, 3U, 6U, 9U) and then determine the average values X.