JDM Model Reference Code — What This Mark Means
A model reference number specific to the Japanese domestic market that differs from the international version. JDM codes often follow unique formatting conventions, such as Seiko's alphanumeric SBDC or SARB prefixes.
What This Usually Means
Japanese watch brands often assign entirely different model reference numbers to watches sold domestically versus those exported internationally. For example, a Seiko diver known internationally as the SPB051 may carry the JDM reference SBDC001. These JDM codes typically follow the brand's domestic cataloging system and can indicate subtle differences in dial text, packaging, or included accessories compared to the international counterpart.
Where to Find It
The JDM reference code is commonly found on the case back, warranty card, hang tag, or original packaging. On Seiko watches, it typically appears on the case back alongside the caliber and case codes. Citizen JDM references often appear on the case back or printed on a sticker inside the packaging.
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Common Variations
Seiko JDM models use prefixes like SBDC, SARB, SBDX, SARY, and SBGA, while international versions use SPB, SRPB, and similar codes. Citizen JDM references often begin with different letter combinations than their global counterparts. Orient JDM models may use entirely separate reference numbering systems from their international catalog.
Common Misconceptions
A common misconception is that JDM model numbers always indicate a significantly different or superior watch. In many cases, the JDM and international versions are mechanically identical, differing only in model code and possibly dial text. Additionally, some collectors assume JDM references are always more valuable, but pricing depends on the specific model and its features rather than the reference format alone.
What to Do Next
Search online for both the JDM and international reference numbers to compare specifications and identify any differences between variants. Collector forums and watch databases often maintain cross-reference tables linking JDM codes to their international equivalents. Understanding both references helps when buying parts, finding reviews, or assessing market value.
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Related Markings
An alphanumeric code stamped on the case back that identifies the specific watch model or product line. This number is e
Case Reference NumberA manufacturer-assigned reference number identifying the specific watch case design, dimensions, and material. This is t
Kanji Case Back InscriptionJapanese characters (kanji or katakana) engraved or printed on the case back of watches sold in Japan. These inscription
PSC Diamond Safety MarkA small diamond-shaped symbol required on consumer products sold in Japan under the Product Safety of Consumer Products
Domestic Market Dial TextJapanese text printed on watch dials indicating features or specifications in the domestic language. Common examples inc
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Frequently asked questions
Why does my Seiko have a different model number than I see online?
You likely have a JDM version. Seiko uses separate reference systems for domestic (e.g., SBDC) and international (e.g., SPB) markets. Both numbers refer to the same or very similar watch.
How do I find the international equivalent of my JDM model?
Watch forums, Seiko's regional websites, and collector databases often maintain cross-reference lists. Searching the JDM code alongside the brand name usually yields comparison results.
Are JDM models always better than international versions?
Not always. Many JDM and international versions are mechanically identical. Some JDM models have exclusive dial variants or finishing, but this varies case by case.
Can I get warranty service on a JDM watch outside Japan?
Warranty policies vary by brand. Some manufacturers honor warranties internationally, while others restrict service to the country of purchase. Contact the brand's local service center for guidance.
What does the SBDC prefix mean on Seiko watches?
Seiko's JDM prefixes encode the watch category. SBDC typically indicates a Prospex diver, SARB denotes a Presage dress watch, and SBGA signifies a Grand Seiko Spring Drive model.
Do all Japanese brands use separate JDM reference numbers?
Most major Japanese brands maintain separate domestic and international reference systems, though the degree of difference varies. Some models share references across markets.