Luminox Watch Leatherback Sea Turtle Giant 0320 Series XS.0329.1. The Leatherback Sea Turtle watches boast a 45mm case, case back and bezel constructed of CARBONOX. Water resistant to 10 ATM, the new dive watch with its PU strap and stainless steel buckle, is built to perform at sea and on land. Like every Luminox timepiece, it incorporates the Luminox Light Technology, making sure that your timepiece is visible in any light conditions for up to 25 years.