[MRM]

The windows are very old. They could easily be 100 or so, but they might be from the 1930s. They come from a time when windows were all made with all wood and small glass was cheaper to manufacture than big sheets of glass. That’s why you have so many individual panes. They’re called divided lights. These days large sheets of glass are cheap to manufacture but the labor to install small panes is expensive, so true divided light windows are expensive. Most divided light windows these days have interior frames pressed into the glass to make a “simulated” divided light.

So much for the history lesson. The point is that there Are layers upon layers of lead paint on those windows. The glass will be regular old fashioned glass. No tinting, low-e, double panes, tempting, etc. old fashioned window glass like we grew up with. It might break easily but it shouldn’t be too hard to replace the individual lights.

The problem is the wood. If any substantial part of the frame is rotten it’s going to be hard to repair without simply rebuilding another frame, complete with individual lights, and you reuse the old glass.

Sounds like a neat project. Let us know how you make out.