Flown by Uffz. Otto Polenz, this early "Berta" was forced down behind Nationalist lines on 4 December 1937 along the Aragon front at Corta Azaila-Escatron.  We are fortunate that the aircraft was extensively photographed during the subsequent evaluation by French and Russian technical teams; this is the most thorough coverage of a Jumo-powered 109 of which I'm aware.  These photos were taken during the Russian evaluation of the aircraft, and appeared in a small paperback some time back; I was forwarded these scans, and unfortunately do not have the name of the publication in which they appeared...