It indeed might not be 100% original. Another explanation could be that it is a transition piece. There are lots of examples of vintage GS's with a dial from a later model along with a previous model movement (in the same line though), eg a 5722-9990 with a 43999 movement. I like such pieces but they are generally less sought after (although 100% original)
Lovin it so far. The dial has a great amount of depth because of how many layers there are. The outer ring appears black most of the time so it's a bit more understated but it's a nice surprise when the cyan pops in direct light
The gmt hand adds a lot of lightplay, and when the sapphire on the dial completely reflects the light there's a really trippy effect where the colors disappears and you only see the gmt markings, the gmt hand and the reflection of the indices above
The strap is good but I think I'll swap it out for something a bit darker. The fact that the tail of the strap doesn't stick out is great though, I'll try to reuse the buckle
The polished concave bezel is a really great design element because it's harder to scratch than a convex one, but a lot of the time it looks like one
The finishing is pretty simple on most of the watch (brushed flanks polished top, I wouldn't have guessed it's titanium if I did not know), but there are some nice touches such as the bezel or the two finishes on the crown (which I love although it's a bit hard to grip)
The lume is how I expected it to be: mediocre. The indices are okay but the hands glow noticeably weaker
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