Here are some pictures of their 21" Margie doll.  The doll is made of hard plastic with bendable knees and a vinyl head that turns when the legs are moved.  So far, the 2 most common hairstyles I've seen are a bubble cut and a long ponytail (often found long and flowing).  There are no markings on the doll's head or body but the face bears a striking resemblance to "Cissy" by Madame Alexander.