Thanks for replying. The windows are vinyl double panes. I'm getting moisture between panes on two of them. I did find some info on the vinyl part (MTOL-89 NC 1029 CBA)
Nothing on the glass itself.
Sometimes, it can be difficult to tell who made the windows. What material are they made of? Any etched markings in the glass corners? If you can lift the sashes out, are is there any information on the edges of a sash? Does the locking hardware contain any words? Can you post a detailed picture?