Originally Posted by ricksplace
Definitely an adjustable mask. I saw one like it on ebay a while ago. They are usually used in an enlarger to mask negatives without having to have a stable of negative holders of different sizes.
I agree with what you say and have one. But this looks like a Cambo board fit. I can not find it on the Cambo site.
"There are a great many things I am in doubt about at the moment, and I should consider myself favoured if you would kindly enlighten me. Signed, Doubtful, off to Canada." (BJP 1914).