I received a brass lens with some other stuff recently and I have attached a couple of pictures. The only writing on it is 20146 engraved on the barrel (it could be 2014.6 or 2014-6). It has a strip of obviously home made Waterhouse stops but the slot for them does not look home modified so I assume it always had waterhouse stops. If it wasn't for the stops, I would think it was a projection lens. It is about 1.25" diameter and 1.5" long. Focal length is about 8". Any ideas as to its original use? Steve.