Caldwell balance

Thanks for your photos. Based on what I see here, you have either our S380-26 or S385-26, 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.

Your stamp also appears to be a somewhat more outdated core compared to ours. Therefore I recommend weighing your sash on a scale to verify the proper calibration. You can see a chart on each balance's store page that tells you exactly how much weight each one supports.

Comparison of the S378, S380 and S385 balance shoes.