This Bücker is registered with its export line number 51 as the c/n. The real c/n is not known, but is between 101 and 125. It was built in July 1941 as Spanish Air Force 35-28, was reserialled ES.1-28 and later E.1B-28, and became civil as D-EIII in Dec-1982. In Mar-1989 it became OO-EII and in Jul-2012 it became D-EPAX.