SpecStudio
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Seiko SNK803
Ref. SNK803K2
Stock unknown
Case
- Diameter
- 37mm
- Lug width
- 18mm
- Material
- Stainless Steel
- Finish
- Brushed
- Water resistance
- 30m
- Caseback
- Exhibition
Crystal & dial
- Crystal
- Hardlex
- Shape
- Flat
- Dial colour
- Tan
- Indices
- Arabic numerals
Movement
- Caliber
- Seiko 7S26
- Type
- Automatic
- Beat rate
- 21,600 vph
- Power reserve
- 40h
- Jewels
- 21
Seiko
Seiko's legendary budget automatic caliber that powered the original Seiko 5 line and SKX diver series for decades. Lacking hacking and hand-winding, it is mechanically simple with just 21 jewels, but this simplicity contributed to its remarkable durability and low maintenance requirements. Now discontinued in favor of the NH35/4R35, the 7S26 remains one of the most iconic and beloved movements in affordable horology.
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Seiko on the secondhand market
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2026 so far · +3.6% to +12.7% · 80 matched watches
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In a nutshell
The Seiko SNK803 (ref. SNK803K2) is an automatic watch, with a 37mm stainless steel case, powered by the Seiko 7S26 movement and a 40-hour power reserve. Water resistance is rated to 30m, under a hardlex crystal.
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