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セイコー SBDC031

Seiko and King Seiko (modern)

Seiko Prospex 'Sumo' diver, black SBDC031

What Japanese dealers are asking for a pre-owned Seiko Prospex 'Sumo' diver, black SBDC031, and how to buy one in Japan.

Typical asking price in Japan

¥64,000 ≈ US$400

Range ¥60,500–¥67,800 from 2 dealer listings (1 sold recently), including Japan's 10% consumption tax. Checked 2026-11-02.

Few listings: treat this as a rough guide.

Discontinued; very few examples are on sale at any one time.

What it costs to bring home · Example listing

When was yours made?

Japanese listings often give the serial number or the year. Our Seiko date finder turns it into a production date.

Reading a Japanese listing for this watch

シリアル / 型番 shiriaru / kataban
Serial number / reference number (e.g. 5626-7040).
自動巻き / 手巻き jidōmaki / temaki
Automatic / manual wind.
ハイビート haibīto
Hi-Beat, a fast-beating movement (28,800 or 36,000 beats an hour).
亀戸製 / 諏訪製 Kameido-sei / Suwa-sei
Made at Daini Seikosha (Kameido, Tokyo) or Suwa Seikosha (Nagano), Seiko's two watch factories.
メダリオン medarion
The emblem on the caseback, e.g. the Grand Seiko lion or the King Seiko shield.
ファーストダイバー fāsuto daibā
Seiko's first diver, the 62MAS of 1965.
植村ダイバー Uemura daibā
The 6105-8110 diver, named after the explorer Naomi Uemura.
ツナ缶 tsuna-kan
'Tuna can': Seiko's shrouded professional divers.

More in our guide to Japanese listing terms.

Where to look

Licensed shops that list Seiko among their specialities:

Related models

Prices are what Japanese dealers ask on their own websites, not auction or buyback prices. Condition, papers and dial variant can move a price a lot. See all models in the Japan price guide.