This Lens appears to be the same as the Rochester Optical Co. Single View Lens Variation 1, which also has a Waterhouse slot cut in the lens-shade portion of the barrel, and three stops riveted together.
References: Anthony's Photographic Bulletin, Vol. 17, No. 18, E. & H.T. Anthony & Co. (New York, NY), September 25, 1886, ads p. 9
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