According to Yiannis Mansolas several Spitfire Vb/c were delivered in natural metal to the Greeks as they were about to return home in the Autumn of 1944. These Spits apparently came from Australian Squadrons and in several cases had been painted with sharkmouths already.
I have asked Yiannis if he can verify this information but haven't received a straight answer. Nevertheless there's no doubt some Greek spitfires flew in natural metal OR painted silver after arrival in Greece.
Here's a link where this is mentioned btw
http://imansolas.freeservers.com/Ace...Spitfires.html
Kyrre