Seiko Prospex "Baby Tuna" automatic diver's watch, with water resistance to 200m. Stainless steel case and bracelet. Color is dark blue with white number markers and a yellow second hand. Unidirectional rotating bezel and day-date display, to include Japanese and English weekday designations. Rarely worn and well maintained and preserved as part of a collection. 

Watch sold "as is".  Does not have box, papers or extra links, but the watch is beautiful and in excellent condition.