The fan was a precursor to the center filter. The idea was that you would make part of the exposure with the fan swung out of the way, and then you would swing the fan into place and spin it using the air from a second bulb that attached to a fitting just for the fan. It was a way of dodging in-camera.
From the photo on the ebay auction, the lens originally had the metal fan. There is a fitting for an air tube and attachment points to which nothing is attached.
The words on the lens are "Goerz Berlin", "Hypergon - Doppel - Anastigmat", "Series X. No. 000a F=75mm", "No. 276578". Then there is a control level with two positions labeled, "48" and "96".
The Goerz Hypergon is described on pages 54--55 of Kingslake's book A History of the Photographic Lens.
Seth Broder has posted scans of a 1913 Goerz American Optical Catalog which includes Goerz's description of this lens: http://www.cameraeccentric.com/html/.../goerzcat.html In 1913, you could get this lens new for $49!
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