1980 Fisher Pierce Sigma Instruments Photocell

This one is used and apparently had tape wrapped around it when it was in service. that said, it's not that sensitive either so I don't know how it drifted, being taped over lol. I would like to open it and push the screen down some to let more light in but i can't open it because the plastic is brittle.

Even though it's light gray, it's a 120-285V photocell, which makes me think the church i got this from bought them from Narragansett Electric at one point.