1713 is stamped

Thanks for posting! It looks like you have either the S380-18 with a 1" shoe or the S385-18 with a 1-3/32" shoe. To determine which series is needed for your window, look over the dimensions from the diagram below to confirm the depth of your bottom shoe. Let me know if it does not match either measurement.

Comparison of the S380 and S385 balance shoes.

Unfortunately, I am unable to cross-reference your stamp. So, you'll need to obtain the exact weight of your window to determine the stamp you'll need to select at checkout. Once you've confirmed the series balance you'll need, you'll be able to select your stamp from the chart below the product description.