Balance Springs

Question

They're 15 inches long, and the marking says 1420 BSI.

Tom · Accepted Answer

Thanks for your photos. Based on what I see here, you have either our S380-15, S385-15, or S378-15 depending on the depth of the bottom shoe. That's the only difference between them. I recommend measuring your shoe and referring to our dimensions to confirm the best match.

Comparison of the S378, S380 and S385 balance shoes.