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Genuine Pentax ground glass split image condenser lens for the K1000 Old, KM, KX, Spotmatic, SP500, SP, SP1000, SP II, and the SP IIa film cameras. Last sold by Pentax as part number 23701-L3-01. Also fits Spotmatic cameras though was never installed and sold on that model when new. Please note, the old style focusing screen system in the models listed  above, use 2 parts that make up the focusing system.  The ground glass on top and the Fresnel lens below the ground glass. The Fresnel lens is plastic and damages very easily. Made by Pentax Japan.