Włodzimierz Birnbaum (Walter Drzewieniecki) at the Cadets’ School No. 2 (Korpus Kadetów nr 2 – KK-2), Polish Army, Chełmno. Signed for one of his brothers by Birnbaum and dated: Warsaw, April 14, 1935.
Drzewieniecki Collections, Fronczack Room
Walter Drzewieniecki, Polish Army