Ultrathin Tourbillon Red Gold Onyx

Ultrathin Tourbillon Red Gold Onyx, reference 1UTBR.Z02A.C1375R, is a 2026 Arnold & Son release with a 41.5 mm 18K red gold (5N) case, polished black-onyx main dial with matt concave onyx subdial, black alligator-leather strap with red-gold-covered folding clasp, and the manual manufacture calibre…

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