Any help identifying this lens would be much appreciated. What I do know about it is that it is a Taylor, Taylor and Hobson lens, focal length not yet determined, F4.5 maximum aperture, probably about 2 1/2 inches tall and a similar (maybe 3") in diameter. From my speculating based on aperture and serial #, it seems to be a Series II from about 1915, and a shorter focal length if it is a Series II because it lacks any soft focus control in either front or rear. It COULD be an Aviar, but it doesn't seem like it, as there's no War Department logos and the barrel is bright brass rather than black.
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