For sale is this unusual large and heavy brass refracting telescope lens. It resembles the early petzval type lenses. It has a large brass collar witch lines up with the extended screws on the body. The collar has threading on one end but has no lens here. The only lenses in this piece are in the eye piece where there are three. ( in the eye lens there is a cross hair like mark and 3in - M62). I can find no markings on this piece. Fully closed the lens measures 11" tall, fully open it measures 13 1/2" tall. The brass collar is 4" in diameter. The eyepiece is attached to a long brass tube which runs the length of the body (11"). It can be removed. Please see the photos for details. Perhaps you can identify this unusual antique lens.

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