Introduction
Identifying your clock movement is the first step in ordering the correct parts, including suspension springs, pendulum rods, keys, bushings, and replacement movements. Most mechanical clocks have stamped numbers or manufacturer marks, but beginners often overlook or misread them. This guide explains how to identify your movement quickly and accurately.
Where to Find Movement Identification Marks
Look on the back plate
Most modern movements (Hermle, Urgos, Kieninger) stamp their numbers on the rear plate, usually centered or near the bottom.
Check the front plate if the dial is removed
Some older or American movements place markings on the front plate, hidden behind the dial.
Look for logos or symbols
Manufacturers often use logos such as “H” for Hermle, “UW” for Urgos, or “K” for Kieninger.
How to Identify Hermle Movements
Hermle uses a three-part numbering system
Example: 451-050 94cm. The first section identifies the movement family; the second identifies the escapement and train layout; the third is pendulum length.
Common Hermle prefixes
Popular families include 340, 350, 451, 1161, and 1050.
Hermle logos and marks
Hermle often uses an “H” or “Hermle” stamped clearly on the back plate.
How to Identify Urgos Movements
Urgos uses “UW” prefixes
Example: UW32/1 or UW03001. The “UW” identifies the manufacturer.
Urgos numbering styles vary by era
Older Urgos movements use slashes; newer ones use long numeric strings.
Common Urgos families
UW32, UW03, UW66, and UW7/ series are the most common.
How to Identify Kieninger Movements
Kieninger uses letter-based prefixes
Examples include “KSU,” “RS,” “MSU,” and “PS.”
Look for the Kieninger logo
A stylized “K” or the full name “Kieninger” is often stamped on the back plate.
Pendulum length is often included
Similar to Hermle, Kieninger includes pendulum length in centimeters.
How to Identify American Movements
Look for manufacturer names
Seth Thomas, Ansonia, Waterbury, Ingraham, and Sessions often stamped their names on the plates.
Look for model numbers or patent dates
These help narrow down the movement family and required parts.
American clocks rarely use standardized numbering
Identification often requires comparing plate shapes, wheel layouts, and suspension styles.
How to Identify Unmarked Movements
Study the plate layout
Train spacing, plate shape, and arbor arrangement often reveal the manufacturer.
Check the escapement type
Deadbeat, recoil, and platform escapements help narrow down the movement family.
Compare suspension and pendulum hardware
Different makers use distinct suspension blocks, springs, and pendulum hooks.
Common Mistakes When Identifying a Movement
Reading the pendulum length as the movement number
Numbers like “94cm” or “66cm” are pendulum lengths, not model numbers.
Confusing case labels with movement numbers
Labels inside the case often refer to the clock model, not the movement.
Assuming all German movements are interchangeable
Hermle, Urgos, and Kieninger use different parts and are not cross-compatible.
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FAQs
Where do I find the movement number?
Most movements have the number stamped on the back plate. Some older clocks place it on the front plate behind the dial.
What if my movement has no markings?
Use plate layout, escapement type, and suspension style to narrow down the manufacturer.
Do Hermle, Urgos, and Kieninger movements interchange?
No. Each manufacturer uses unique parts and numbering systems.
What does the pendulum length number mean?
It indicates the required pendulum length in centimeters, not the movement model.
Why is identifying the movement important?
Correct identification ensures you order the right suspension spring, pendulum rod, key, mainspring, or replacement movement.
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