I picked up this oversized tank and reels in a lot of darkroom equipment. I've searched around and haven't found a reference to identify it. It doesn't appear to be a bulk reel because it doesn't look like it would hold much more than a standard 35mm roll (although I haven't tried loading one onto it). My best guess is that it was for processing E3 which had to be fogged with light (thus the larger spacing between the film). I'm thinking it might be useful for highly dilute development.

The reel in question is on the left and a standard one on the right. Anyone know for sure? The tank is marked Nikor btw.

Thanks....