Case Reference Number — What This Mark Means
A manufacturer-assigned reference number identifying the specific watch case design, dimensions, and material. This is the primary identifier for sourcing correct case parts and compatible accessories.
What This Usually Means
The case reference number is distinct from the model number in that it specifically identifies the physical case construction. It encodes information about the case shape, material, dimensions, and crystal type. This number is essential for ordering replacement parts like bezels, crowns, crystals, and case backs.
Where to Find It
Typically engraved between the lugs (at 12 or 6 o'clock), on the case back, or on the case side. Removing the bracelet or strap may be necessary to read numbers located between the lugs.
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Common Variations
Formats differ by brand. Some use purely numeric references, others include letters for material or market designations. Updated versions of the same design often receive suffix changes while maintaining the base reference.
Common Misconceptions
The case reference and model number are often treated as interchangeable, but they can differ. The case reference identifies the physical case, while the model number may encode the complete configuration including dial and movement variants.
What to Do Next
Search the case reference online to find exact specifications, compatible parts, and current market values. This number is the most reliable way to communicate exactly which watch you have when seeking professional service.
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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
Lug Width MarkingA number stamped between or on the lugs indicating the distance between them in millimeters. This measurement determines
Case Size IndicatorA marking indicating the watch case diameter or dimensions, typically in millimeters. This helps identify the watch mode
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Frequently asked questions
Is the case reference the same as the model number?
Often similar but not always identical. The case reference specifically identifies the case, while the model number may describe the complete watch configuration.
Where is the case reference number located?
Most commonly between the lugs at 6 or 12 o'clock, on the case back, or occasionally on the case side.
Why do I need to remove the bracelet to find it?
Numbers engraved between the lugs are hidden by the bracelet end links and can only be read when the strap or bracelet is detached.
Can the case reference help me date my watch?
It can narrow down the production period since references are associated with specific model generations, though the serial number is more precise.
What information is encoded in the case reference?
Typically the case shape, size, material, and sometimes crystal type. The exact encoding varies by brand.
Do aftermarket cases use the same reference numbers?
They often reference the original number for compatibility but may include their own identifiers as well.