Norse Raven Knotwork Question

[Ánleifr]

Hi, can someone help me with this image? I was told it was a raven but I am having a hard time determining how it is facing, is it up and down or left and right? Also, does anyone know of its origin or on what artifact and timeframe it dates to?

http://i1095.photobucket.com/albums/i461/Tuck479/Norse-Teucrian/IMG_0030.gif