How to Identify an Unmarked Clock Movement

Identifying an unmarked clock movement can seem like a daunting task, especially if you are new to clock repair or restoration. Without a manufacturer name or model number on the movement, how do you know what you have and what parts you need? Fortunately, there are proven steps you can follow to correctly identify the movement and ensure a smooth repair or replacement process. In this detailed guide, we’ll walk you through how to identify an unmarked clock movement using careful observation, precise measurements, and a little expert help.

Step 1: Examine the Back Plate

Start your investigation by removing the movement from the clock case and examining the back plate. The back plate holds a wealth of clues. Focus on the shape — is it square, rectangular, round, or does it have unique curves or cutouts? Examine the corners and edges carefully.

Use a **caliper or ruler** to measure the exact height and width of the back plate. Write these numbers down. Even small differences in measurements can separate one model or manufacturer from another. Pay attention to any unique features like extra holes, slots, or cast markings. While some movements may lack brand names, they may have batch numbers or visual identifiers that only show on the back plate.

Step 2: Count the Wheels in the Gear Train

Look closely at the gear train, the system of wheels that powers the movement. Count how many wheels are in each train — time, strike, and chime. Take note of their sizes and positions. For example, some movements have three wheels in the time train, while others may have four.

The center wheel, third wheel, and fourth wheel arrangement can help narrow down the manufacturer. Take clear, close-up photos from multiple angles to review later or to send to a clock expert if needed.

Step 3: Measure the Hand Shaft Length

Next, measure the hand shaft length, also called the arbor length. This is the distance from the front plate of the movement to the tip of the minute hand shaft. Use precise tools, not a rough ruler estimate. This measurement determines whether the clock hands will fit correctly and is essential when ordering replacement parts.

Step 4: Check the Winding Arbor Spacing

The winding arbors are the keyholes you insert a key into to wind the clock. Measure the horizontal and vertical distance between each arbor. Movements vary widely in how these arbors are positioned, and these measurements help pinpoint which movement series or model you have.

Step 5: Identify the Escapement Type

Examine the escapement, the part of the clock that regulates time. Is it a recoil escapement, deadbeat escapement, pin-pallet escapement, or platform escapement? Watch the movement in action or take a video to study later. The shape and action of the verge, pallets, and escape wheel can reveal a lot about the type of movement.

Step 6: Count the Hammers and Chime Rods

For chiming or striking clocks, count how many hammers are present and note how many chime rods they strike. Record whether the movement plays Westminster, Whittington, or other melodies. Some movements have as few as two hammers, while others can have eight or more. This is especially useful when trying to match a replacement movement.

Step 7: Review the Pendulum Setup

Look at how the pendulum attaches to the movement. Does it use a suspension spring, or does it have a crutch with a slot or hook? Measure the pendulum length from the suspension post to the bottom of the bob. An incorrect pendulum length can throw off timekeeping, so this measurement is critical for replacement or repair.

Step 8: Use Reference Charts and Resources

Once you’ve gathered all your data, compare it to manufacturer identification charts. Many movement makers use distinctive plate shapes, arbor spacing, or gear layouts. Clockworks.com offers a helpful library of reference guides and charts, as well as photos for comparison.

Browse our Tools section to find everything you need, including let-down tools, bushing tools, and hand pullers — all essential for taking careful measurements and completing your repair.

Step 9: Ask the Experts

If you’re still unsure, our team has decades of experience and can often identify a movement by sight or help guide you to the right solution. Expert help can save you time, money, and frustration.

Step 10: Order the Right Parts and Tools

Once you know the correct movement, you can confidently order replacement parts or an entire movement from Clockworks. We carry a vast selection of mechanical movements, quartz movements, and repair tools. Whether you’re a professional repairer or a DIY enthusiast, we have everything you need to complete your project successfully.

Pro Tips

• Take multiple clear photos from the front, back, and sides.
• Label every part you remove and keep small components in bags or containers.
• Record all measurements clearly and double-check them.
• Keep the old movement as a reference, even if you replace it.
• Only use proper tools — never force parts or guess measurements.

Summary

Identifying an unmarked clock movement may seem challenging, but by following a structured approach — examining the back plate, counting gears, measuring key components, and consulting expert resources — you can confidently figure out what you’re working with. Visit Clockworks.com or email clockworks@clockworks.com for friendly expert support and the highest quality clock products.

Updated on: 12/07/2025