New Nikon Violet Fluorescent microscope filter for the Labophot, Optiphot, Microphot and TMD series of microscopes.  This violet cube is new old stock and has never been subjected to fluorescent light!  The specifications are:

Dichroic mirror (DM)- 430 nm

Barrier Filter - 590 nm

Exciter Filter -380 - 425 nm

Violet excitation radiation; for mono amines, formaldehyde induced fluorescence such as (Catecholamines, SHT).  This filter is free from fungus, dust, scratches, and coating separation. It was priced at over $600 when it was last offered.  These filters are hard to find and even more hard to find in this condition.