I was putting away the yarn from my mothers ASJ, which I have finished - it's having a bath right now, and I found this blue yarn:
Now, I'm pretty sure that the yarn I left at book club a month ago was Patonyle in navy, and that's what this is too! Either way, it is an exact match:
That's the old yarn and the one I just found, together, and they are the exact same colour!
There is only 13 grams, so I don't know if it will be enough to finish both sleeves, and the iCord front, but if it is I won't have to wait another month to declare this project done!