This is a loose component from an enlarger I used to have.

Below is the eBay AAI description:

This Berkey Omega Modular Dichroic System C760 Component Loose is an excellent addition to your photography equipment. With a focal length of 80mm, it is suitable for darkroom enlarging lens. The unit is in black color and is a multicolor unit that can print variable contrast papers using Magenta/yellow. The equipment is suitable for film photography and is made in the United States.

The brand is OMEGA, and the model is C760. It is a dichroic type of equipment that comes as a single unit. The unit quantity is one, and it is ideal for those in the market for enlarging equipment. This item is listed under the categories of Cameras & Photo, Film Photography, Darkroom & Developing, and Enlargement Equipment.