Unidentified MANN doll

I found this unusual doll at a thrift store and have been trying to research some information on her. I know she is a Seymour Mann doll but most of his later dolls were mass produced and I can not find another doll like this one. Most off his followers have the ink stamp on the back of their neck, but this one only has an impression. This doll has me totally intrigued. I plan to try to clean her up and try to find someone to restore her for me. I will post the after pictures later.