Hello there!
Thank you for reaching out to us. Our Series 775 appears to be a match for what you have here. Your stamp is a bit odd and doesn't match any of the listed strength options, however. I recommend you weigh your sash on a scale to determine the proper option for your replacements. There's a chart under the product description on the S775-30 store page that will tell you which option is best based on the weight of the sash.
What you want to measure is the width of the shoe in your first photo. I'll also attach a photo below you can use as a reference.
