A home owner from USA says:
August 3, 2016
Paul from SWISCO responded:
August 4, 2016
Thanks for posting. Looks like you have a 37" block & tackle balance with a stamp option of 3640. I'm afraid that's all I can tell based on your information, though. Now you just need to pick out the top and bottom fittings in order to determine the Series.
I recommend that you look at our Channel Balance Home Page and follow the steps in order to find the Series that best matches what you have.