School #21 was a school in Lodz. The students in #21b were boys, and they attended classes in the afternoon. Most students were between 8 and 14 years old, meaning that they were born between 1927 and 1933.
School #21 was located at Ulica Wrzesnienska 34. The street name was changed to Königsberger Strasse when German occupation began in 1939. See
www.lodz-ghetto.com for a map of Ulica Wrzesnienska and the rest of the Lodz ghetto.