sash balance 350?

Thanks for your photos. Based on what I see here, you have either our S380-29 or S385-29, 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.

As for the stamp, if your sash is precisely 35 pounds then you could use either of the two options you picked up. You may want to double check the weight, though. Your old stamp indicates that it's 38 pounds, not 35. Just something to keep in mind.

Comparison of the S380 and S385 balance shoes.