mint little people doll signed with papers
 

Was given a doll in 1981 as gift from xavier roberts. He has never been used or displayed. Bottom signed in black ink (stamped), birth certificate signed by xavier roberts himself. Original clothes, brown eyes, no hairs, tag still attached. Have box it was shipped in and invoice (no charge)and birthday card from babyland general. Does anyone have any idea what it is worth?
Thanks!