This filter cube is new "old stock" from a former Nikon dealer inventory. It will fit the Nikon Eclipse series of fluorescent microscopes, E400, E600, E800 and TE200/300. It is in the catalog with a product number of 96174 and Listed as HQ: GFP LP (Long Pass). The list price is $1,293.00. GFP refers to Green Fluorescent Protein- Endow. The cube is in new condition and still in its' plastic bubble case.. 

Blue Excitation Filter Block GFP HQ LP (Green) Specifications:

Excitation Filter Wavelengths: 450-490 nanometers 

• Dichromatic Mirror Cut-on Wavelength: 495 nanometers LP

• Barrier Filter Wavelengths: 500 nanometers LP