Tom from SWISCO responded:
October 20, 2016
You can usually use your old stamp as reference, but if you have no stamp or if you can't read it, you can always just weigh your sash on a scale and refer to the chart on the S350-27 store page.
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Tom from SWISCO responded:
October 20, 2016
Yep, a stamp of "26 5" usually corresponds to our 2650. You can always weigh your sash to be 100% sure, but I think that's a safe bet.
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