Hello, Simon.
I translated the basic information from the Spanish website as follows:
http://www.aire.org/paracas_ea/avos/avc352.htm
Once the civil war ended, the license for the fabrication of the Junkers 52 was obtained in Germany, and series production began in 1942 by CASA (Construcciones Aeronauticas, S.A.) in their re-born factory in Getafe. Two years later, the first of them flew, powered by German BMW engines, and this engine would be the one that would power approximately the first one-hundred examples of the total 170 CASA 352 produced.
Their exterior aspect is almost identical (ref. to the Ju-52 3/m), it barely differs from the German model because they have a wider central engine cowling, and the radio-finding (ADF) antenna is missing. The last aircraft were delivered in 1954.
Besides other missions, they were used to drop parachutists in Alcala de Henares, and in Alcantarilla.
Officialy called the T.2B, the majority were withdrawn from use around 1973, with the last example flying at the Alcantarilla Parachute School until July 1978.
Four are preserved:
Static at the Museo del Aire in Cuatro Vientos
at the Base Aerea in Torrejon
at the Military Parachuting School
Engines: 3 ENMASA "Beta" E9C producing 750hp
Saludos,
Tulio
Oh! Remember that similar aircraft were also built in France (the Toucan), and these too, saw combat in Indochina and probably in Algeria.