You're gonna be even happier when you thought you bought a regular two-tone version and when you posted it here you discover it's titanium, with a little bit of tantalum thrown in
The caseback should say "TITANE" and what you have bought is a fairly rare and very cool Seamaster Chrono "TiTanRAu", named for it's tri-metal titanium (case / bracelet) - tantalum (bezel, blue-ish color) - rose gold (accents) construction.
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