Japan 122 Channel balance Stamp

A quick learner from Selden n y says:
Have a 1/2 inch 21 inch balance the stamp on side reads Japan 122 . What potion do I use?
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Tom from SWISCO responded:
I see you were looking at our S700-21. Is that what Series balance you have? If so, I recommend weighing your sash on a scale and comparing that weight to the list of options on the S700-21 store page. That will let you determine which option is best for you.
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