This is a unique style of window to the area, and not many more than a dozen are left in existance. Just over the last few years two windows have been lost to fires, and one to “upgrading”.
As you can see by the photo, the sash is shaped like a rectangle with a 4:3 ratio width to height. The ends of the rectangle are capped in semicircles, whose diameters are equal to the height. Many of these sashes opened by dropping into a cavity,or pocket, in the wall. Most of the formerly operable sashes are now sealed shut.
The exterior casing was always the same, with that distinctive “mantle clock” shape, the sill often running several inches horizontally past the vertical casing.
That is all that is known about the window. Where the pattern came from, who built them, why around Port Colborne, how many originally were installed, and where, all remains unknown.
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