I had ordered some yarn off ebay that was advertised as just 'navy wool', no band, no other information - and I am very pleased to find that it is lovely! Incredibly thin, so I knitted it double. Shame that I don't know what it is, I might get more. It was very affordable too so I am even more pleased that it gives a lovely finished texture and very slight colour variation. Because it has a slightly crepe-like feel to it I would think that it might a blend.
I love the detail of the pattern: