I was given a box full of darkroom accessories today (it came out of a loft and was wrapped in newspaper dated 1981) ... amongst it all was this, mounted in a tinplate "Nebro" brand lamp housing.

I'm presuming as an item it is of interest only to collectors of memorabilia, rather than of any practical use? Or would it still function as a usable safelight? (I know, I can do a safelight test)

vintage by _loupe, on Flickr