Interestingly, I bought a couple tubes of dubbing around that same time period, which I still have, but I don't think mine came from Leiser - although I did buy some books from him.

It could be that someone else was also using the tubes - my dubbing may have been distributed by Cortland, but I have no way of knowing now. I've used mine for dry flies, although you could use it for nymphs.

One of my dubbing tubes (with the green mayfly embossed cap as you describe) has a label that says "12 Pale Olive". Mine is some type of dyed fur - doggone if I know what kind it is - it seems a bit too coarse for rabbit. I've used this dubing to make some killer Grannom dry flies over the years, with still enough in that tube to tie many more. Mine is an absolutely wonderful dubbing - almost like it has several subtle colors mixed together, and something you won't easily find these days.

John