Ultrathin Tourbillon Skeleton Red Gold, reference 1UTBR.Z01A.C246R, is a 2024 Arnold & Son release with a 41.5 mm 18K red gold (5N) case, openworked dial with white-opal off-centred time subdial, blue alligator-leather strap with red-gold-covered folding clasp, and the manual manufacture calibre…
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