Gents A. Lange & Sohne Flyback Chrono 1815 Boutique Edition in 18k white gold Ref # LSLS4143AA circa 2017. On original dark blue reptile strap with 18k white gold deployment buckle. Smooth bezel with sapphire crystal. Manual wind movement with subdials for seconds and 30 min counter. Silver dial with blue painted Arabic numerals. Box and papers dated February of 2017. Pristine condition.