[Seiko SPB453 - high positional variance dial up]
I have the SPB453 with 6R55 and curious if anyone else may have experienced high positional variance in the dial up position. On a Weishi 1000, I’ve tested many times in six positions in the dial up position seems unstable and can fluctuate overtime if left in the same position on the timegrapher. Fully wound the rate can be as high as +3 seconds a day settling to +12 or 15 s/d. Dial down position is very stable and consistent overtime as is all other positions other than dial up.
For example over 30 minutes in DU the rate fluctuates as follows.
DU readings:
s/d->amplitude
+0 → 276°
+20 → 264°
+9 → 273°
+7 → 275°
+25 → 262°
DD readings:
+4 → 289°
+4 → 286°
Amplitude also increases in DD. Anyone else see this behavior?