Original AN/ PAS23 germanium objective lens assembly. In good condition, each lens varies in terms of scratches, wear, and finish on the housing. Actual lenses are clean and scratch free. These are specifically lenses that came from the 25um 320x240 sensor versions. They can be installed onto 320x240 17um devices, but they lack the proper mounting surfaces for the sensor and driver board. It is technically a different design of objective lens physically speaking.