Business Overview Since our founding in 1967, Nanan Seiko Co., Ltd. has focused on the development, design, and manufacturing of machinery, as well as component processing, always acting with customer satisfaction in mind and earning the trust of many clients.
Our business is broadly divided into three areas: (1) Machinery Business, (2) Component Processing Business, and (3) Watch Business.
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Machinery (Design and Manufacturing)
We handle everything in-house, from concept and design to manufacturing and installation.
Concept and design are carried out by our design department using CAD, and after mechanical design, our electrical design department performs electrical wiring design and control system design for operating robots.
Assembly, including wiring, is conducted at our Hotaka Factory, followed by installation.
Precision Component Processing
Our component processing mainly focuses on prototypes and custom, one-off precision parts.
We work with a wide range of materials, including difficult-to-machine materials, as well as aluminum, steel, and copper, primarily through cutting processes.
By utilizing a combination of equipment such as NC lathes, machining centers, Y-axis lathes, compact NC lathes, and wire EDM machines, we are able to handle complex shapes.
We are also equipped with a full range of measuring instruments to ensure the quality of processed components.
Watches
At Nanan Seiko, watch manufacturing has been one of our core businesses since our establishment in 1980.
Today, we operate one of the few remaining assembly factories in Japan and engage in both the development and manufacturing of our own products as well as OEM contract manufacturing.
At our head office factory, we also operate “Tokeiya Fukkokudo,” which sells and repairs Japanese antique watches, original watches, and various brand-name watches. Skilled watchmakers on staff handle repairs for general customers.
About OEM Manufacturing of Wristwatches
Scope of OEM Wristwatch Business
- From wristwatch design (*1) to product delivery
(Minimum order quantity available upon inquiry) - From wristwatch engineering/specification design to product delivery
- Procurement of wristwatch components, domestic assembly, and packaging (*2)
*1: Please consult us regarding design.
*2: Packaging specifications and packaging materials will be arranged separately upon consultation.
Supported Models
- Quartz wristwatches: 2-hand, 3-hand models, multi-axis and chronograph models
- Quartz wristwatches: Solar-powered models
- Mechanical wristwatches: Standard models
Available Movement Manufacturers
- MIYOTA
- SEIKO EPSON
- SII (TMI)
- Others, including certain Swiss brands
Assembly Capacity
Standard models: 10,000 units per month
Minimum Order Quantity
From 1 unit (subject to design and other conditions)
Quality and Precision
One-year warranty based on Nanan Seiko quality standards
- Appearance Quality
Inspected visually from a distance of 30 cm for any abnormalities. - Functional Quality
- (1) Timekeeping Accuracy:
- For quartz watches, depends on the performance of each manufacturer’s movement.
For mechanical watches, adjustable to a daily deviation of +20 to −10 seconds (fully wound). (*3) - (2) Water Resistance:
- Up to 10 ATM is tested using air leak testing; above that, water immersion testing is conducted.
Features of the Watch Business
- Technical Support Available
• With experienced technical specialists on staff, any quality issues can be addressed domestically.
• Rather than simple outsourcing, we handle specification review and manufacturing in-house, enabling us to propose better products.
• Technical consultation on movements is also available. - Flexible Response
• We provide products with stable quality. • Depending on the situation, we can also supply jigs and components. - Strong Procurement Capability
• We secure components through our own factory and partnerships with multiple overseas factories. - Strong Relationships with Watch Manufacturers
• We maintain an environment that enables reliable manufacturing.
We can also provide the following to customers.
- Machinery, inspection equipment, and jigs
We can also provide tools and components related to watches. - Various manufactured parts
Process Flow for Watch Manufacturing
Introduction of Our In-house Brands
Azusa
TMPL
Media Coverage
