Tonbo Research · Glossary
JDM Watch Glossary
Plain-language definitions of Japanese listing terms, condition vocabulary, and platform concepts. A reference for buyers sourcing watches from Yahoo Auctions Japan and Mercari Japan.
美品
美品 (bihin) means beautiful item or near-mint condition in Japanese watch listings. How to ...
Buyee
Buyee is Japan's leading proxy buying service for international buyers. It provides a Japa...
中古 (Chuuko)
中古 means used or second-hand in Japanese. On Yahoo Auctions Japan and Mercari Japan watch ...
Condition Grades
Japanese watch sellers use a standardized condition vocabulary — from 新品 (new) to ジャンク (ju...
動作確認済
動作確認済 (dosa-kakunin-zumi) means operation verified. The seller has confirmed the watch is ...
Frankenwatch
A frankenwatch is a watch assembled from parts of multiple watches, often misrepresented a...
不動
不動 (fudo) means non-running or immobile in Japanese watch listings. A watch listed as 不動 d...
箱付き (Hako-tsuki)
箱付き means the watch is sold with its original box. For Japanese auction listings, box pres...
Hi-Beat
Hi-Beat refers to Seiko automatic movements running at 36,000 vph (beats per hour), double...
保証書あり (Hoshousho-ari)
保証書あり means the watch is sold with its original warranty card or papers. For JDM watches, ...
ジャンク
ジャンク (junk) in Japanese watch listings means sold as-is with no expectation of operation. ...
JDM
JDM (Japanese Domestic Market) refers to products sold exclusively or primarily in Japan. ...
Marinemaster
Marinemaster is Seiko's flagship professional dive watch line, sold primarily in Japan und...
Mercari Japan
Mercari Japan is Japan's largest fixed-price consumer marketplace. For JDM watch buyers, i...
NH35 Movement
The Seiko NH35A is an automatic movement produced by Seiko's TMI division. It powers most ...
OH済
OH済 (oh-zumi) means overhaul completed. A Japanese watch listing term indicating the movem...
SARB
SARB is a Seiko reference number prefix identifying Japanese Domestic Market dress watches...
即決 (Sokkettsu)
即決 means buyout or buy-it-now on Japanese auction platforms. A listing with a 即決 price can...
Spring Drive
Spring Drive is Seiko's proprietary hybrid movement combining a mechanical mainspring with...
Yahoo Auctions Japan
Yahoo Auctions Japan is Japan's largest online auction platform. For JDM watch buyers, it'...
ZenMarket
ZenMarket is a Japan proxy buying service that lets international buyers purchase from Yah...
Guides for active buyers
Long-form analysis on JDM arbitrage mechanics, proxy buying services, and model-specific buyer guides.
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