Sorry I wasn't clear. Ulrika Ruding's chapter on Orrefors marking in Wickman, "Orrefors" is the clearest explanation of the coding Orrefors used. She says that the coding 100 O to 968 0 signifies glass designed and perhaps made in 1965, but she includes a fair number of caveats about Ariel numbering in general. However, I think it's fairly safe to say that your piece dates from 1965. The ariel design used is one used by Lundin a fair bit. The shape of vase and the colour are less common. However, I have seen pictures of her very popular ariel piece with a face on it in this shade of brown.
For me, this a much better find that one of the fish graal pieces (and probably worth much more, too).