Balance Spring Assmbly

Quick Learner from Massachusetts, USA
Sep 11, 2022 10:52 am
I have the double balance spring as shown in the picture but the stamp on the spring near tongue just says 5K. Can you assist with proper replacement?
1 user uploaded image
2 Replies

Tom from SWISCO
Sep 14, 2022 2:54 pm


Hello! Your pivot shoe appears to be a match for our 15-177, which is designed to work with our Series 152 coil spring. Since your old spring is stamped with 5, that means you likely want the 5 pound S152-5 option.
I believe these parts can work for you but look them over and see what you think.
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