Thanks! I was indifferent of the gold caseback when I got this so no. Having a plain one works for me though since I live in a very humid country and I don't want to worry too much about it deteriorating.
I may get a 44GS one down the line with a gold medallion, but replace it with an aftermarket see-through one.
Awesome. I would love to see these in person but unfortunately there aren't places near me that stock higher end Seiko (never mind Grand Seiko) regularly.