This 41mm modified Seamaster 300 case combines stainless steel construction with a matching mesh bracelet for a cohesive, professional appearance. The sapphire crystal provides exceptional clarity and scratch resistance, while the design accommodates NH35 automatic movements seamlessly. Built for discerning collectors and custom watchmakers who demand quality materials and precise engineering in a classic dive watch silhouette.

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Specifications:

• Case Material: stainless steel

• Case Diameter: 41mm (excluding crown)

• Dial Fitting Diameter (Bezel Opening): 31mm

• Case Thickness: 13.5mm

• Lug Width: Standard length compatible with 20mm straps.

• Weight: Moderate for alloy construction.

Key Features:

• Movement Compatibility: Specifically engineered for easy installation of NH35, NH36, and NH38 automatic movements.

• Crystal: Sapphire Glass for superior scratch resistance and clarity.

• Crown: Screw-in Type for enhanced water resistance and security.

• Water Resistance: 3ATM Enhanced by screw-down crown and case construction (rating not officially stated).

• Strap Compatibility: Features 20mm concave lugs for a seamless fit with standard straps and bracelets.

• Clasp Style: Included Single-Fold Deployant Clasp for secure and comfortable wear.

Construction Details:

• Case & Bezel: Precision-machined alloy with a clean, unbranded profile.

• Case Back: Solid screw-down case back.

• Dial Seat: Flat surface designed to accommodate a 31mm dial with standard feet for NH-series movements (3 o'clock crown position).

• Gaskets: Typically includes basic gaskets for movement and crystal sealing. For high water resistance, upgraded aftermarket gaskets are recommended.

Important Notes for Buyers:

• Unbranded / DIY Product: This is a generic case with no registered trademark or logo. It is sold as an accessory.

• Assembly Required: This is a case only. Movement, dial, hands, and strap must be purchased separately.

• Water Resistance: 3bar

What's Included:

• 1x Unbranded 41mm Stainless Steel Case

• 1x Sapphire Crystal (installed)

• 1x Screw-down Case Back

• 1x Single-Fold Deployant Clasp

• Necessary case gaskets (movement, crown, case back)

Ideal For:

• Creating a custom, personalized watch.

• Watch modification projects.

• Prototyping for microbrand concepts.

• Re-casing an existing NH-series movement.