Nikon-Chroma TRITC fluorescent filter cube that fits the Nikon labophot, labophot-2, Optiphot, Optiphot-2, TMD Inverted Microscope and the Microphot. The Chroma number is 41002 and is new still in original plastic storage container (not pictured). 

The Chroma specifications are:

• Excitation Filter Wavelengths: HQ535/50X nanometers 
• Dichromatic Mirror Cut-on Wavelength: Q565  LP)
• Barrier Filter Wavelengths: HQ 620/60m