Not only did A. Jaegers Optics make superb telescope objectives they also did custom orders for hundreds of companies all over the world! These were custom made for American Optical, labeled "AI 737 and AO 610-641". May have been used as some sort of light diffuser/condenser system on a microscope as the top (aspheric) side is polished and the bottom (plano) side is ground but not polished. Edge thickness is 1mm, center thickness is 8mm. Unused.