Experienced some initially weird behaviour with my new Seiko SBDC063 (JDM version of the SPB079) and its 6R15 movement.
Received it Friday -- beautiful watch :- ), and felt great on the wrist, but to my horror it seemed to be visibly gaining time (!) (a couple of seconds a minute?) and also occasionally stopping (!) Since I had wound it (25X?) and had been wearing it for an hour or so at that point, I was alarmed. Wound it a bit more, but same continued. Put it back in box & wrote to AD asking what I should do.
AD customer service was closed over weekend, but yesterday they came back to me and said wind it 40 times and leave face up in box and see what happens. Well, to my surprise this time the watch seemed to be running at pretty well +0 s/d over 12 hours. Knowing the tendency of Seikos to gain time when resting face up, I put it on for a couple of hours last night and this morning, and indeed it seems to be losing a bit of time on the wrist (more than I would like, but not alarmingly so) (-16s/d pace? = about -10 s/d in normal use cycle if stored on back overnight).
I am still a bit of a newcomer to the "watch world" but I've bought a lot(!) of mechanical watches over the past six months, and have never encountered this behaviour. Normally a brief wind to get the watch going + being on the wrist seems to be fine.
Can anyone offer any explanation for why the watch would have initially had such erratic performance? It seems to have "recovered" but is this a sign that something could be wrong? I've read a number of threads on WUS that talk about the 6R15, but nothing seems to touch on my experience. Also, have this movement in at least five of my other Seikos, all of which have had 0 issues and performed to COSC-like accuracy.