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Rob LIt's hard to tell from your picture, but the diameter is small (circumference of 7.9 inches). So far in my research, the size variations of Figure 8 balls seems to be great in the late 19th Century with circumferences ranging from 7.5" to the standard 9.25". The ball on the left in the photo below is a c1880s-90s ball that has a similar diameter to yours. My best guess is that this ball is a c1890s to turn of the century ball.