[blodorn]

100 year old windows were designed for easy maintenance and repair. Are the double hung windows? If they are, you can make sure to have storm windows on which effectively work as a double pane window. If this new glass were available, you could replace every pane in your window without removing a nail.

[drewcoo]

> window without removing a nail

There'd be brads to pull at least part-way out to release sashes, though. And the damned cords and all that.

Much easier to re-glaze a removed sash!

[drjasonharrison]

I seriously doubt they would provide the glass without frames, which requires removing the moulding around the existing window.

[pests]

Selling panes of window glass that you then frame in is a common method for larger windows or odd shapes.

Here is a random product on Amazon, custom cut Low E insulated window panes: https://www.amazon.com/dp/B0DHD4F3HY

I see no reason why the company in this post wouldnt.