Need to know weight rating of balance

A quick learner from Kansas City, MO says:
I have identified this as the series 390 channel balance.
I'm not sure how to read the weight rating from the stamp: 22 9 GX CMC 11
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Emily from SWISCO responded:

Hello!

Your stamp "2290" is actually from an older rating system that we don't use. To know that option to select, weigh your sash on a scale and refer to the chart on the S390-23 's store page. This chart will show you which option you'll need based on the weight of your sash. 

Just note, our Series 390 comes with the 15-001 1-1/8" deep shoe so make sure yours matches this. We also carry the Series 351 , which has similar fittings but it has a 15-002 1" deep shoe. 

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