Pottery & Porcelain Marks – Arrows: Arrows have been used as
marks since the early 19th century, about 1828, and are still
used today. Earliest marks are a line with an upside-down
v-shaped symbol on top. Later marks have two arrows, usually
crossed, with a few lines jutting outward on each side at the
bottom. These marks appear most often on earthenware, but they
also appear on art pottery and stoneware. Harker Pottery Co. is
one of the main producers of 20th century American pottery with
arrow marks.