window channel balance

34" sounds right. Your stamp is known as "3350" according to our system, as well. You'll need to know that when you go to order, and you can verify it by checking the weight of your sash against the chart on the balance webpage (once you get there). Now, we need to identify your balance Series. I can only see the bottom of your balance, so I can't tell what you need. Look at our channel balance guide to determine your balance Series, or send photos of both ends of your balance.