This 39.5mm vintage-style watch case is made from 316L stainless steel as its primary material. 316L offers excellent corrosion resistance, strong oxidation resistance, and outstanding machinability, making it ideal for precision CNC processing. The typical manufacturing process includes raw material cutting → CNC turning of the outer diameter and inner cavity → five-axis machining of the lug structure → drilling and tapping (strap hole positions) → final precision finishing of the inner chamber dimensions.
With a thickness of 16mm, the case provides sufficient installation space and waterproof structural allowance (including gasket grooves) for the NH series movements. For cases compatible with Seiko NH35/NH34/NH36/NH38/NH70/NH72 movements, the key technical considerations include:
Inner diameter tolerance control of the movement seat (typically maintained within ±0.02mm)
Thread accuracy and concentricity of the case back
Coaxial alignment between the crown tube and the movement stem
Vintage designs typically feature a thicker case body and curved transition structures, which place higher demands on CNC toolpath optimization and polishing uniformity. After machining is completed, the case undergoes multi-stage polishing or brushing processes to ensure that the vintage aesthetic texture coexists with industrial precision.
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