"Double Back Stitch" -- This may be the same stitch that was used on the items that I pinned made in Mexico in the "traditional Mazahua" style or method. (This looks like it might be more complicated and more dense though.
tree mug. Dow Redcorn Mug at MudFire Gallery - love the tree design. Wheel thrown stoneware mug. Hand carved, painted with slips, underglazes and food safe glaze. x x click through to see the acorn design on the bottom