BSI 3090

Thanks for writing in! Your channel balance reminds me of our Series 395 Channel Balance. Specifically, you'll need the S395-31, although, you may want to confirm that the length of the metal channel is 31".

I am unable to cross-reference your stamp, so I'll need to confirm the exact weight of your sash to choose the correct stamp. There is a chart with stamps listed according to their weight ranges. You'll be able to determine the right stamp using the exact sash weight.