I seem to be the only selenium-cell shooter. I realize most of the meters are dead by now, but if you found a camera from this era that was safely stored in its case, many times the meter is still active. The selenium cell era was quite interesting.
I use a Sekonic Studio Deluxe that I bought new just several years ago. When I picked it up, the young camera store sales person tried to sell me batteries for it
The only selenium meter camera that I ever used was a Contax "Cyclops".
That is called grain. It is supposed to be there.