Seiko Prospex LE Slim Turtle Black Series Night Vision Diver's 1968 Reissue Watch SPB335J1Seiko Prospex Limited Edition Slim Turtle Black Series Night Vision Diver's 1968 Reissue Watch SPB335J1 The SPB335J1: Turtle Origin The completely brushed and streamlined 41mm C shaped case with the screw down crown at 4 oclock is still here. None of the case measurements have changed for this black version. Lug to lug, it still measures just under 47mm, and its still one of Seikos slimmest automatic divers watches at 12. 3mm thin. I really like how