[Sergio Luis dos Santos]

The plane is a Heinkel He 111 bomber. It´s one of several versions prior the well know all glazed nose. Maybe someone can give you the exact version.

The Ju 52 early models where single engined but soon were changed for a 3 engines configuration that´s the well know version used on all battle fronts as well as several air lines in the civilian version. The ones you call Ju 52 are smaller planes Junkers W 34 or maybe Ju 46.