Just written a long reply and then accidentally deleted it! I was the person who bought that GS. Long story short Seiko UK were a total pain to deal with. Initially they said there was evidence it had been opened in the past and when (with help from the seller and a previous owner) I was able to prove they had opened it for regulation under warranty they got really defensive about how much pride they take in their work and how there was no way they could have been a contributing factor. In the end I coughed up for the work but the best bit is when I received it back from their meticulous craftsmen it was full of dust and had to go off again!
I'm fairly sure it was a manufacturing defect and that's fine in itself but the attitude of the UK service centre was pretty confrontational. I still like GS, the way the light plays on some of the dial and handsets it's the best I've ever seen in any watch but I'm not sure the quality is all it's sometimes made out to be. I've owned 3, the entry level quartz was flawless, this one had issues when I bought it so I'm not counting that but I also had a sbgr095 that had to go back for a smudge on the minute hand. I'd like to try spring drive at some point but I think the quartz models are where the best value and quality lie.
https://i.imgur.com/lvRfWVb.jpg?1