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Hi mate, it's a Ref TB 396.1231 in Titanium & 18K Solid Gold with a Calibre 1445 Quartz Day-Date movement, not that many of them around these days but I've got a lot of love for the Seamaster Titane as it's a very cool and technically impressive case design even by modern standards.
Back in the 1980s, a titanium watch with solid gold inlay with a complicated quartz movement made this thing absolute cutting edge in its day.
https://www.omegawatches.com/en-au/watch-omega-seamaster-polaris-tb-396-1231