What stamp option should I choose for 11/07UNIQUE 17-B-20

A quick learner from Regin, Saskatchewan says:
The stamp for my existing (broken) balance (1/2" X 18" Series 380) is
"11/07UNIQUE 17-B-20". I presume that would be replaced with option 1750: 17 to 20 lb. ?
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Tom from SWISCO responded:
It looks like your stamp likely corresponds to the S380-18's 1720 option, but that if you want to be completely sure you should weigh your sash on a scale
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