The La1.5Ca0.5FeMo1-xWxO6 double perovskites with x 0.3 crystallize in a monoclinic type structure having P21/n space group. The magnetizations at 4 K as well as the Curie temperatures increase when the tungsten content is higher. The reciprocal susceptibilities follow a Néel type temperature dependence, characteristic for a ferrimagnetic system. The magnetic properties are analysed considering the presence of cluster glass superposed on an essentially ferrimagnetic type ordering. The electrical resistivities increase when the tungsten content is higher. A minimum in their temperature dependences can be shown at T 220 K. The temperature and field dependences of the magnetoresistivities were analysed. The contributions of the intergrain tunneling magnetoresistance as well as the spin disorder inside the grains were determined. The degree of spin polarization increases as the tungsten content is higher. A model for the distribution of iron and molybdenum ions in different valence states is also given.