Hermle HM451-050/85DBL Mechanical Clock Movement

The Hermle HM451-050/85DBL is a premium German-engineered mechanical clock movement designed for traditional longcase, grandmother, and tallcase clocks. Combining reliable 8-day operation with classic striking functions and enhanced aesthetic features, this movement is ideal for restorations, replacements, and custom clock builds where both performance and appearance matter.

This movement uses a weight-driven, cable-operated system to provide consistent power delivery and smooth, dependable timekeeping for approximately eight days on a full wind. It features a bim-bam strike pattern, delivering a single strike at the half-hour and a two-tone strike on the hour on chime rods or gongs, producing a rich and traditional sound.

The “DBL” designation indicates decorative backplates and extended visual detail suited to clocks with glazed or open back cases, offering both mechanical precision and visual appeal behind the dial. Designed for an 85 cm pendulum length, the movement offers classic rhythm and presence typical of quality German clock movements.

Robust brass construction and precision cut gears ensure durability and long service life. The rear hammer configuration accommodates standard chime rod or gong assemblies, making installation straightforward in many grandfather and grandmother clock cases.

Key Features & Specifications

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  8-day mechanical operation — winds once per week

  
  


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  Cable-driven weight system for smooth, consistent power delivery

  
  


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  Bim-bam strike pattern (half-hour single, full hour double)

  
  


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  Three-hammer strike assembly for traditional sound quality

  
  


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  Designed for 85 cm pendulum length

  
  


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  DBL feature: decorative backplates for enhanced visual appeal