Looking at first glance like the well-known Dodge FBY 661 (on which the image is based), this is, in fact, a Chevrolet. Only a handful of Malta buses carried this style of grille (none with this body style) and none lasted into the yellow era. The registration, like the vehicle itself, is fictitious. That said, even if I say it myself, it looks absolutely right and it is a great pity that such a vehicle does not exist (26-Dec-12).
See my complete set of Malta Buses here:
www.flickr.com/photos/northernblue109/sets/72157626237269...
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