Unknown manufacturer. 

Used lens with some signs of wear.

For ~ 500-700 nm (see attached spectrum) wavelength.

Looks like Laser beam expander or collimator lens. 

Metal and glass - solid as a rock! 

Diameter - 38 mm. Length - 85 mm. Focusing distance ~ 35 mm .

Attached Spectrum and pictures - from actual Lens!

Feel free to ask me questions before bidding!