Yeah, we had a house in Atlanta with alternating triangular panes with wooden muntins, made in the 1920's, that became a historic district while we were there, so the windows couldn't be replaced, but they were casement windows so you could open them all up for quite a nice breeze through the house. We actually cleaned and stripped one frame but that took so long we just left the rest alone after freeing them up to open, they had been painted shut.
There was a time when every corner hardware store would cut glass to size too. Now a thing of the past.