Gender: boy
School:
School #20A
I believe that Abram is the boy who signed the book for A. Gincberg because when conducting a search for his name in the lodz ghetto onhabitants resource, he is the only Abram Gincberg who has a birthdate that corresponds to the dates of borth for students in school #20A.
This is Abram's work identification card because of the corresponding name, address, and birthdate.