This antique Seiko Sportsmatic calendar watch is a true gem for collectors. With a head only, this automatic wristwatch is perfect for men who appreciate the classic style of diving watches. The watch features an analog display, mechanical movement, and was manufactured before 1920.

The Seiko brand is well-known for its quality and this watch is no exception. It's perfect for those who are looking for a unique piece to add to their collection. Whether you're a watch enthusiast or just someone who appreciates vintage items, this Seiko Sportsmatic calendar watch is a must-have.