I turned over all my collection but was surprised to notice the only house with color inserts in its windows. I would be happy to tell there were more, but I only can recall these ones from Borisoglebsk, Yaroslavl Oblast. I doubt whether I had seen them anywhere else.
By the way it was there, in Borisoglebsk, that someone explained me that color inserts mark both rather old age of the frame and less-than-average status of the house owners.
Zoom-in of the color glass shows that it is a bit thicker at its bottom. In my view, it is one more proof of its advanced age.
Yet so far, literature has offered no proof for my hypothesis that owners opted for small color glasses because they were cheaper.
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