Single-turret 7TP tank.

Photo published in a book: Leszek Komuda, "Polski czolg lekki 7TP", TBiU No.21, Warsaw (1973?).

The Polish photo published prior to 1994 without any copyright note, therefore assumed to be public domain.

According to the non-retroactive copyright law of July 10, 1952, of the People's Republic of Poland, all photographs published prior to May 23, 1994 without a clear copyright notice are considered to be public domain. This applies worldwide.