Tom from SWISCO responded:
March 30, 2016
Stamps ending with "90" use an old rating system that has fallen out of use. One of our stamps may still work, but you will need to weigh your sash to determine the proper match.
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Tom from SWISCO responded:
July 13, 2016
Referring to the chart on the S390-28 store page, there are two possibilities. The 2750 can carry 26 through 30 pounds, while the 2760 can carry 30 through 33 pounds. You may want to get a more exact weight to see if it leans one way or the other. If it's exactly 30 pounds down to the ounce, then I suppose either could work.
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Tom from SWISCO responded:
July 15, 2016
If the metal channel is 30 inches then the S390-30 would definitely be the length you want. That's a little odd, though. A 2790 stamp implies a metal channel length of 28". I'm not sure why you have this configuration.
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