no stamps on the S380-36 Series Chanels

Question

I have a 4 ft wide, 6 ft High Window installed in a house built in 1988.
I can't find a stamp number on it to determine weight.
It seems to say "Caldwell" and maybe E5 but it is difficult to read.

Tom · Accepted Answer

Hello! I can see the stamp in your third photo. It reads "35 4," which corresponds to our 3540 option. You can always weigh your sash on a scale to be 100% sure that's right.