🔧 Replacement mainspring suitable for the compact clockwork movements commonly found in Darton barographs and other scientific recording instruments. This spring is non‑magnetic and has a silvery finish, indicating a stainless spring alloy typically used in later or serviced meteorological instruments.

📦 Each Pack Contents:


🧰 Applications:

đź’¬ Bulk Orders & Trade Pricing
We offer discounted rates for bulk purchases. If you require larger quantities or trade supply, please contact us directly to discuss pricing and availability. We hold a very large range of British Precision hairsprings, please contact us if you require anything specific. **Please Note: we cannot help with application**

🛠️ We carry a wide inventory of springs for Smiths, Jaeger, and other period instruments. Not all items are listed, so please get in touch if you’re searching for a specific spring

âś… Returns & Customer Satisfaction:

We operate a no-quibble exchange or refund policy. Customer satisfaction and positive feedback are paramount to our business.

If you’re not happy with your purchase, simply return it in original condition and we’ll refund or exchange—no fuss.

⚠️ Note: If this item is purchased for a non-compatible application and returned, postage costs will be deducted from the refund.

 

🏍️ About Timeless Motorcycles:

Based in Mansfield Woodhouse, Nottinghamshire, we specialise in the refurbishment, repair, and servicing of Smiths Chronometric & Magnetic Speedometers & Tachometers. Trusted by restorers worldwide, we’re proud to support the preservation of classic British instrumentation.