These became popular in the 1870s and soon replaced the CDV size photo for family portraits. They were common until the turn of the century when they were replaced by larger photographs and different mounting techniques. In 1888, roll film was patented by George Eastman. This caused an immediate explosion of amateur photography and a corresponding decline in CDVs and cabinet photographs. To repeat, value is totally dependent on subject matter.
Images showing the life of the times are very desirable and can have very substantial value.
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