I am looking for round windows with stainless trim. I will be building a very vintage matte black, greaser-style teardrop and would like to avoid the modern-looking rectangle and round corner windows with the heavy rubber edges. The real boat portholes are neat, but are just too massive.
It also would not be too hard or expensive to just go to an auto glass shop and have a round piece cut, then mount it with some simple flexible trim from the auto parts store.