Emily from SWISCO responded:
November 18, 2021
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. |