Replacement balance s385-18

A quick learner from San diego says:
Reading stamp on old channel.
Reads as:
17 2 CU CMC 4

Which option does this fit?
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Bob from SWISCO responded:

Thanks for writing in! Good question. A stamp code of 17 2 conforms to our stamp option of 1720, which is for a window sash in the weight range of 8 through 12 lbs. Let me know if you have any other questions.

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