I have the same watch and can change the battery myself, though I do need the right tools for the job: a vice, a watch holder, and a set of case openers. I sourced the 371 Seiko-branded battery (I tried off-brand, and they don't last as long) from Amz, and voilà. Granted, you must be handy and careful (cover either side of the watch with a silicon or plastic sheet to prevent scratches). Alternatively, please take it to any watchmaker (worth its salt), and this should be a 5-minute job.
I am keen on photography and GS, so I tend to play every now and then; I have one of these foldable lightboxes from Aliexpress that is pretty handy for taking a quick shot.
Well can't really say for sure but a Google search returned two options, these are as follows AA1B811J0 and AA1B811J0, man I saw some pictures of the combination and damn grand seiko knows how to make a gorgeous piece for sure.
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