This is a Voxson Tanga of which there appear to be two versions- AM andf FM- I think yours is the AM one. There is info about it here if you can read Italian: http://www.grix.it/viewer.php?page=8057
The four holes are for the aerial, output to the amplifier and power in but no details are given on which is which. It needs an external amplifier to drive a speaker. The radio probably dates from early to mid 1970s.