I believe it to be freeblown swirl. No mold lines at all, the pattern rounds the base, and stretches in all the right places. The pics are crappy in the flourescent light, I'll try to get better ones 2morrow in the sun. Trying to verify glasshouse.
Yes, but it appears to have been blown in a patterned dip mold, and it looks like it was swirled to the left and swirled to the right? Is it a broken swirled pattern?
It does appear to have been swirled both directions. I don't know about dip molds. I thought it was a common shoe polish bottle when I first saw it rolling out. The ribs can be felt inside the bottle on the sides, but the inside of the base is smooth. I'm also trying to confirm that it was an ink, although the residue inside looked like mucilage.