Chronoswiss Opus, the nicest skeleton watch in my opinion. This is the new style that came out in 2021 and is 41mm. Like new condition, only worn a dozen times or so. Complete with box and papers. Current retail is $13,000. Yours for only $5500 plus shipping. Local deal if you are near Long Island. I've been buying and selling watches for 20+ years and have tons of references.