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6309-7320 · SK-018

Seiko 5 Automatic Square

€83≈ $90Available
Made
Nov 1985
Condition
C · Good
Dial
Appears original
Movement
6309A automatic
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Ships from Vilnius, Lithuania Lithuania: Omniva parcel locker €2.99, 1–3 working days. EU: , tracked, 2–5 working days, no customs fees. UK, USA & rest of world: , tracked, 5–10 working days. Import duties and taxes may apply. 14-day right of withdrawal and 1-year guarantee. Details Shipping is added and shown at checkout, before you pay. By buying you accept our Terms of sale.

About this watch

Seiko 5 Automatic Square, reference 6309-7320, with the 6309A automatic movement (17 jewels), made in Nov 1985. Champagne dial with gold pyramid markers at 12 and 6, dot markers, day-date window with English day wheel, in a square steel case. Comes on a brown leather strap (aftermarket). The dial appears original; it has not been inspected under magnification. Condition grade C – Good: clear wear and patina from decades of use.

Specifications

Reference6309-7320
Movement6309A automatic, 17 jewels
Production dateNov 1985
DialChampagne, gold pyramid markers at 12 and 6, dot markers
Day wheelEnglish
CaseSquare stainless steel
Condition gradeC what this means
Case, hands, movementOriginal Seiko Seiko
Dial originalityAppears original (not inspected under magnification) Appears original how we check
Bracelet / strapBrown leather strap Aftermarket
IncludedWatch only

Honest notes

  • Corrosion spots on the caseback
  • Wear and scratches on the case
About this model

The Seiko 6309-7320

The Seiko 6309-7320 is a Seiko 5 automatic (6309 family, export). It runs on Seiko's calibre 6309, an automatic movement with 17 or 21 jewels, beating 21,600 times an hour. It can't be wound with the crown and winds itself as you wear it, and the seconds hand keeps running while you set the time. Seiko made the 6309 from about 1976 to 1990. Seiko 5s in round, cushion and square cases with colourful sunburst dials. The 6309-7040 Turtle diver uses the same movement.

Is it original? The small dial code at 6 o'clock should start with 6309, like the caseback. If it starts with another number, the dial was made for a different model (a replacement dial).

What is it worth? A running 6309-7320 in average condition usually sells for about €60–130 in Europe; an original dial, a strong colour and the original bracelet push it up. Price guide

Everything about the Seiko 6309-7320 →

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Movements

Seiko 6309 guide: the movement behind the Turtle and the Seiko 5

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How to

How to set the day and date on a vintage Seiko 5

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Buying guide

Vintage Seiko buying guide: 10 checks before you buy

How to buy a vintage Seiko without regrets: caseback and dial codes, redials and replacement dials, movement, crystal, bracelet, serial dates and fair prices. The checks we use on every watch.