Most of this website is about Pre-1940 windows. We are beginning to consider mid-20th century windows made in the 1950s and 1960s. These later windows are fundamentally different than earlier windows.
Many 1950s and 60s windows are worth taking care of, and some of them are now even considered historic. As with older windows, stick with the intent of the original maker, keeping with the same materials and details used in their original construction.
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