Ultrathin Tourbillon Platinum Onyx, reference 1UTBX.Z03A.C1375C, is a 2026 Arnold & Son release with a 41.5 mm platinum (Pt950) case, polished black-onyx main dial with matt concave onyx subdial, black alligator-leather strap with platinum-covered folding clasp, and the manual manufacture calibre…
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