Lorsa HS 237B Automatic Watch Spare Parts: Essential Guide for Collectors and Watchmakers
The Lorsa HS 237B is a Swiss automatic watch movement known for its reliable mechanical design and efficiency. It is a modified version of the Lorsa 237 manual wind calibre, featuring automatic winding with a monometallic two-leg screw balance operating at 18,000 vibrations per hour (vph). The calibre measures 10½ lignes (approximately 23.3 mm in diameter) with a height of 4.0 mm and incorporates 15 jewels for reduced friction and durability.
Key Technical Specifications
Calibre: Lorsa HS 237B (automatic)
Base Calibre: Lorsa 237
Size: 10½ lignes (23.3 mm diameter)
Height: 4.0 mm
Jewels: 15
Frequency: 18,000 vph
Balance: Monometallic two-leg screw balance (non-shock protected)
Escapement: Traditional Swiss pallet lever
Winding: Yoke winding system with bidirectional rotor
Functions: Hours, minutes, small seconds, date (pointer type on some models)
Common Spare Parts
Balance Staff & Assembly: Crucial for accuracy and balance oscillation
Mainspring & Barrel: Preferred genuine or New Old Stock (NOS) for stable power delivery
Rotor & Yoke Assembly: Essential for automatic winding functionality
Stem & Crown: Precision parts for winding and setting the watch
Date Mechanism Components: Date driving wheels and jumper for pointer date function
Gear Train Wheels: Ensure smooth and efficient power transfer
Jewels & Bearings: Reduce friction and increase movement durability
Hands: Appropriate hour, minute, and sub-seconds hands maintaining vintage authenticity
Maintenance and Sourcing Tips
Verify HS 237B markings to ensure exact part compatibility
Source NOS or genuine original parts from trusted Swiss movement suppliers
Employ experienced watchmakers with expertise in vintage automatic calibres
Importance of Genuine Spare Parts
Ensures movement accuracy and efficient automatic winding
Preserves collector value and mechanical integrity
Supports proper restoration and long-term reliability
Authentic spare parts for the Lorsa HS 237B automatic calibre are essential to maintain the mechanical excellence and heritage of these vintage Swiss watches, highly valued by collectors and horologists worldwide.
For any Watch Spare Parts inquiry, Email us for rate and availability: [email protected]
Watch Parts Enquiry
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Stem, Crown, Hands & Spares might be available for this movement.
Email us for rate and availability: [email protected]
Mobile/WhatsApp: +91- 9841 360 340