How to Find the Model or Case Number of Your Watch

When ordering replacement parts, watch straps, or accessories, it's essential to know your watch's model number or case number. These numbers identify the exact version of your watch and ensure compatibility with spare parts.

📌 Model Number vs. Case Number vs. Serial Number

Model Number: The reference number of your complete watch. Usually found on paperwork, the original box, or engraved on the case back (e.g., SKX007, SRP777, SRPD79 or T137.410.11.041.00).
Case Number: Stamped on the back of the watch case (e.g., 7S26-0020, 4R36-04Y0, 4R36-07G0 or T055417A). This helps identify compatible parts like bezels, crystals, and gaskets.
Serial Number: A unique production code engraved on the case back or between the lugs. (example for Seiko: 641234)
🔍 Note: While many people refer to this number, it is not needed to find replacement parts. It only identifies the specific production batch or unit, not the type of parts used.

🕵️ Where to Look

1. On the Case Back

Flip your watch over and look at the back of the case.
You may see a number like: 7S26-0020, V157-0DL0, or 7T62-0ED0.
This is usually engraved or laser-etched on stainless steel or metal case backs.

2. Between the Lugs

Some watches have the case number engraved between the lugs, where the strap connects to the watch. You may need to remove the strap to see it.

3. Original Box or Paperwork

Check the original packaging, instruction manual, or warranty card.
The model number is often printed here, typically starting with a few letters (e.g., SKX007, SNK809, AR2452).

4. Inside the Case Back (Advanced)

For professionals or experienced users: Some case numbers are only visible inside the case back.
This requires opening the watch and should only be done with proper tools.

🔢 Common Seiko Formats

	Example Seiko Model Numbers	Example Case Number
Seiko	SKX007 / SKX007J1 / SKX007K1	7S26-0020
Seiko	SRP777 / SRP777J1 / SRP777K1	4R36-04Y0
Seiko	SRPD79 / SRPD79K1 / SRPD79P9	4R36-07G0
Seiko	SPB143 / SPB143J1	6R35-00P0

🔢 Other common Formats

Brand	Example Model Number	Example Case Number
Tissot	T137.410.11.041.00	T137410A (or similar)
Citizen	BM8180-03E	E101-S006597
Fossil	FS4487	FS-4487
Diesel	DZ2110	DZ-2110

🛠️ Still Can’t Find It?

Take a clear photo of your watch (front and back) and contact our customer support. We’ll help you identify the model or case number so you can find the right parts.