125th Anniversary slide for the Postal Microscopical Society (P.M.S.), prepared by Klaus Kemp. Arrangement in the shape of a microscope. Mounted in Styraclor. Olympus BHB microscope using 450nm LED light. 10x Nikon Plan Apo NA 0.45 objective. Olympus Aplanat Achromat condenser, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. Single image (no stacking).