Model Number Stamp — What This Mark Means
An alphanumeric code stamped on the case back that identifies the specific watch model or product line. This number is essential for ordering replacement parts and identifying your watch's specifications.
What This Usually Means
The model number tells you exactly which product line and variant your watch belongs to. It often encodes information about the dial color, bezel type, bracelet style, and movement used. This is the key identifier when searching for specifications, compatible parts, or current market value.
Where to Find It
Typically stamped or engraved on the case back, often near the center or around the perimeter. On Seiko watches, you'll commonly see it in a format like "7S26-0010" on the case back.
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Common Variations
Each brand has its own format. Seiko uses a caliber-case format (e.g., 7S26-0010), Citizen uses alphanumeric codes (e.g., BN0151-09L), and Tissot often uses a T-prefixed number. Some brands include sub-variants for regional differences.
Common Misconceptions
People often confuse the model number with the serial number or caliber number. The model number identifies the product line, not the individual watch. Also, the same model number doesn't always mean identical specifications across all production years.
What to Do Next
Search the model number online to find your watch's full specifications, user manual, and compatible accessories. This number is essential when contacting customer service or ordering replacement parts like straps, crystals, or bezels.
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Related Markings
A unique alphanumeric code engraved on the case back that identifies your individual watch. This number is typically use
Case Reference NumberA manufacturer-assigned reference number identifying the specific watch case design, dimensions, and material. This is t
Caliber NumberA manufacturer's identifier for the specific movement (mechanism) inside the watch. This number reveals the movement typ
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Frequently asked questions
How is the model number different from the serial number?
The model number identifies the product line and is shared by all watches of that type. The serial number is unique to your individual watch.
Can I find my watch's specs from the model number?
Yes. Searching the model number online typically reveals the full specifications, including movement, dimensions, water resistance, and more.
Why does my watch have multiple numbers on the case back?
Case backs often display the model number, serial number, water resistance rating, and material markings. The model number is usually the most prominent.
What if I can't find my model number on the case back?
Some watches print it on a sticker inside the case back, on the warranty card, or on the original packaging.
Do model numbers change across generations?
Often yes. Updated versions of the same watch typically receive new model numbers, even if the design changes are minor.
Can I order parts using just the model number?
In most cases yes. The model number is the primary identifier used by parts suppliers and service centers.