Omega Seamaster Aqua Terra Co-Axial 150M (Ref. 231.12.42.21.01.002) is a pre-owned automatic men's/unisex watch in very good condition, showing only minor, intangible signs of wear. It features a 41.5mm steel case with a sleek black dial and no numerals, protected by a sapphire crystal, and boasts a robust 15 ATM water resistance. Powered by the Omega Caliber 8500 automatic movement with 39 jewels and a 60-hour power reserve, this timepiece is presented on a brown leather bracelet with a steel fold clasp. It comes complete with its original box and papers. Located in Geneva, Switzerland, it is available for a negotiable price of CHF 5,600 (approximately $7,021) and will be procured upon purchase.