Published by on August 16, 2026 The Seiko Octagon Watch 7439-5000 is a vintage men's quartz wristwatch with a unique octagon-shaped case. Featuring a stainless steel band and caseback, this watch is not water resistant and does not come with papers, service records, or original box. With a classic analog display and 12-hour dial, this Seiko watch is a timeless piece for any watch enthusiast.