The Certiga Works CW04 is described as an automatic GMT movement intended for watch customization, with a date display and decorative modifications. It is often linked to the Seiko/TMI NH34A, but that relationship is not confirmed; its current availability and country of manufacture are also unresolved.
What is the Certiga Works CW04?
The CW04 is described as a self-winding mechanical movement with central hours, minutes and seconds, a central GMT hand, and a date window at 3 o’clock. Caliber Corner characterizes it as a movement for watch modding and customization. The available product information is reported by that specialist reference rather than independently tested or verified against an official specification sheet. Caliber Corner
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Certiga Works CW04 specifications
| Specification | Reported detail |
|---|---|
| Movement type | Automatic, self-winding mechanical |
| Functions | Central hours, minutes, sweeping seconds, central GMT hand, date at 3 o’clock |
| Diameter | 27.4 mm |
| Thickness | 5.32 mm |
| Jewels | 24 |
| Frequency | 21,600 beats per hour (3 Hz) |
| Power reserve | About 41 hours |
| Hand winding | Yes |
| Hacking seconds | Yes |
| Lift angle | 53 degrees; Caliber Corner marks this figure as needing confirmation |
These are the values reported by Caliber Corner; they should not be treated as independently verified manufacturer specifications. Caliber Corner
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Caliber Corner says Certiga Works describes the CW04 as based on, or redesigned from, the Seiko/TMI NH34A. The exact relationship is uncertain: the available information does not establish whether the CW04 is literally an NH34A, a modified NH34A, or another movement with a related design. That distinction matters if you are buying a replacement, planning a mod, or relying on interchangeability.
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Do not assume fit or compatibility solely from the NH34A association. Confirm the exact movement and component dimensions with the seller or a watchmaker before ordering parts or beginning a build.
How does the CW04 differ from a standard NH34-based movement?
The reported differences are cosmetic. Caliber Corner describes blue-plated screws and a custom rotor with concentric striping and engraved branding, offered with rhodium or gunmetal coating. It does not report accuracy, regulation, or other performance improvements over an NH34 base. A decorative finish alone is not evidence of upgraded timekeeping or testing.
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Availability, price, and provenance
Caliber Corner reported a retail price of $65 USD and said the movement was unavailable on Amazon and the Certiga Works website when its article was written. That is a historical stock report, not confirmation of present availability or price.
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The country of manufacture is not disclosed in the available source. Caliber Corner also said its author knew of no watch brands using the caliber; this is a limited source finding, not proof that no such watches exist. The CW04’s maker documentation, exact provenance, current sales channels, and current price remain unverified.
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