Stamp option- how do I determine if no stamp?

Home Owner from Colorado Springs
I need to purchase a 27" Series 390 Channel Balance to replace one that has broken on my window. I checked the balance and it has no marking on it denoting the stamp option. How do I determine this?
2 Replies
Casey
Casey from SWISCO
SWISCO
Expert

Hi there- thanks for reaching out! 

You will need to weigh your sash to determine the stamp "option" at checkout. You can just use a regular bathroom scale to do this. If you have any more questions don't hesitate to ask. 

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