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Home/Browse/Seiko/SNK803
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Seiko SNK803
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Seiko · Seiko 5

Seiko SNK803

Ref. SNK803K2

Stock unknown

18 matched eBay listings

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.

Seiko 5 collection · 11 watches

5 Actus
5 Actus
Conceptual SNK807K2
Conceptual SNK807K237mm
Seiko 5 Automatic
Seiko 5 Automatic36mm
Seiko 5 SNKE01
Seiko 5 SNKE0136.5mm
Seiko 5 SNKK27K1
Seiko 5 SNKK27K137mm
Seiko 5 SNKL23
Seiko 5 SNKL2338mm
SNK063J5
SNK063J534mm
SNKE03
SNKE0338mm
SNKP17
SNKP1742.3mm
SNXS79
SNXS7937mm
Alternatives

Market

RetailNot listed

The forum market

Follow the asking price.

Active listings0Across watch forums
Closed · 90d0Asking-price history

No forum listings tracked for this watch yet. Market+ adds the weekly trend.

Retail stock & market context

Seiko on the secondhand market

+10.4%

2026 so far · +5.9% to +17.2% · 91 matched watches

In line with the index

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Summary

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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