Caldwell Channel Balance Spring

A quick learner from Newport Beach, CA says:
Hi, My name is Jerry & I need two replacement Caldwell springs. The only markings say 27 4 GR Caldwell. The metal channel is 28 in. long. By looking at a video I believe that the top end of the balance spring is part number 15P142. I believe the bottom end is 15P102 because it is 1 1/16 in. wide
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Lauren from SWISCO responded:

Hello, thank you for posting,

With this combination of attachments, you could have either an S380 or S385 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. You will need a 28" balance with a 2740 stamp option.

Please review and let us know if you have any additional questions! 

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.

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