Fine Mobach vase by Piet Knepper.
Piet Knepper worked at the Mobach studio from 1941 to 1992. Unique conical form with a large flange mid-way. Colors are deep purple mottled over umber. Hand marks from the wheel are visible. Displays nicely with other pots in this glaze.

Marked: Studio stamp + the Piet Knepper mark