So, this is not technically a wristie, but here is another Grand Seiko Spring Drive (And even though I wasn't wearing it, at least I was holding it ;D)
This one is a Grand Seiko (SBGD201J) which was built at the Micro Artist Studio. They told me it is made out of platinum and retails for around 50.000€ - But I couldn't care less about the price or the material. It was simply stunning and the Spring Drive looks incredible in person!