Seiko 7S26-0020 (AO) Automatic Scuba Diver’s Watch

Classic Seiko diver with reliable automatic movement and iconic tool-watch design
The Seiko 7S26-0020 (AO) is one of Seiko’s most recognized automatic diver’s watches, known for its robust build and reliable 7S26 automatic movement. With its classic black dial, unidirectional rotating bezel, and luminous hands and markers, it’s a trusted companion for both underwater and everyday use. This model has earned its place as a staple among Seiko enthusiasts for its durability, accuracy, and timeless styling.
 
Condition: Excellent overall condition. The display and lugs show very light scratches visible only on close inspection, and the original rubber strap shows minor wear consistent with normal use. The automatic movement winds and runs smoothly, keeping accurate time.
Not included: Box, papers, or additional straps
 
Features
Seiko 7S26 automatic movement
41mm stainless steel case with unidirectional rotating bezel
Black dial with luminous markers and hands
Day-date complication at 3 o’clock
Hardlex crystal
200m water resistance (diver’s rated)
Screw-down crown
Rubber Seiko diver’s strap
 
“A true workhorse diver—reliable, rugged, and a must-have for Seiko collectors.”
 
Frequently Asked Questions
Q: Is this watch suitable for actual diving?
A: Yes, it is rated to 200m and designed for scuba use.
Q: How accurate is the movement?
A: The 7S26 automatic typically runs within ±20–40 seconds/day, and this example is running well.
Q: Can I replace the strap with a metal bracelet?
A: Yes, it’s compatible with aftermarket Seiko SKX-style bracelets.
Q: Does it come with box and papers?
A: No, just the watch and original rubber strap.