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It could probably be 90% remedied with adjustment. Seiko have never adjusted the 7S / 4R / 6R movements at the factory so it's really just pot luck whether you get one that has better or worse positional consistency. The SPB053 I had (6R15) ran at +2.5s/day and it was more or less the same +2.5s whatever I did to it - crown up or face up made no more than 1 or 2 seconds difference to it. All the other Seikos I've had since (apart from the SLA017) have been a lot less consistent even if they keep better time while being worn.
Regal
Howard
Yeah figured. Just weird that it affects that movement so badly. The other autos I have - Zenith / Seiko / Junghans don’t seem to mind being left flat, face up so much.