1914 Horsman Betsey Peterkin doll made of the adtocolite formula made by Aetna see related Horsman Dolls.

Aetna Dolls 1901-1925

The Aetna Doll & Toy Company owned by Benjamin Goldenberg, was located in New York City, they purchased the American Doll and Toy Company 1892-1909 (advertised in 1907 that they were the only makers of composition head dolls in the USA - made the composition head 1907-1908 Fluffy Ruffles doll), was also known as; The First American Doll Factory, Goldstein & Hoffman and The Hoffman Company (owned by Solomon D. Hoffman). 

In 1909 after Hoffman's death, Aetna acquired the famous patent and secret for the "Can't Break Em" composition doll heads.  These doll heads were meant to compete with the huge German market of imported bisque dolls that were easily broken.

ca. 1917-1919 Aetna trade marked a new material called Adtocolite, this material was light, smooth and tougher than the earlier can't break em composition heads, which were distributed by Horsman.  The Peterkin doll by Horsman is made of all adtocolite, when the material cracks, circular bands can be seen, which is different than the earlier can't break em composition material, which usually shows a spidery type cracking.