What weight is this channel balance

Question

I know the style and the length but i can't figure out the weight or series of the channel balance. It is stamped 27 3 BSI od

Casey · Accepted Answer

Hello,

With this combination of attachments, you could have either an S380-28 or S385-28 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'll also need 2730 spring strength options for your replacement balances.

Thank you and let us know if you have any other questions or concerns.

Comparison of the S378, S380 and S385 balance shoes.