Pottery & Porcelain Marks – Words & Initials – O: Four Overbeck sisters from Cambridge City, Indiana, started Overbeck Pottery in the early 1900s. The studio made useful works like teapots in Art Nouveau and Art Deco styles. The sisters also sculpted animals and "grotesques" (extreme versions of people). "OBK" is just one of their marks.

• Circle or Oval
• Crown & Circle or Oval