"aus: NAUMANN, NATURGESCHICHTE DER VÖGEL MITTELEUROPAS: Band II, Tafel 14 - Gera, 1897"
Mechanical copy of 19th century image. Public domain in USA at least.
This image comes from the book:
Naumann, Naturgeschichte der Vögel Mitteleuropas. 3. Aufl. Neubearb. von G. Berg et al. Hrsg. von Carl R. Hennicke. (Naumann, Natural history of the birds of central Europe, 3rd Ed. Revised by G. Berg et al.; Edited by Carl R. Hennicke.) of 1905 or his earlier works.
Nest of Remiz pendulinus penduline tit nest Image from http://www.biologie.uni-hamburg.de/b-online/birds/regengl.htm. "aus: NAUMANN, NATURGESCHICHTE DER VÖGEL MITTELEUROPAS: Band II, Tafel 14 - Gera, 1897" Mechanical copy of 19th century image. Public