I have a reprinted edition of Palliser's New Cottage Homes [[1887). Name:  Palliser's.jpg
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It's a pattern book of house plans, line drawings, and numerous pages of details such as this one:Name:  Palliser's #2.jpg
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In my quick look through, I did not see your exact details. That type of ornamentation could have been ordered and applied by the builder or fashioned by a local carpenter or craftsman.