This is a Hasselblad focusing screen, a component of the Hasselblad V series medium format camera. It is an interchangeable screen used to achieve precise focus. The screen in the image has crosshair-like lines, which were standard on models from 1971 to 1988. This appears to be an "Acute-Matte" screen. It is a very bright and clear screen, allowing for quick and accurate focusing. The screen size is 6x6cm and is made of translucent glass and a silver metal frame. It has been stored at home for a long time. I think the condition is good. It was protected to prevent scratches. Please check the photos to assess the condition.