This is a 52mm 80B camera filter lens by HCE and made in Japan.
This lens filter is a cooling color correction filter used to adjust performance in different light variations. It features the ability to correct differences within the color temperatures of the exact location the photo is taken and the light source. The measurements include both a height and width of 3" and a depth of 0.5".
It comes in a good pre-owned condition free of scratches and is packaged inside of a circular plastic case.