I think I have to concur with Micheal on this one, unless someone comes up with some other evidence. I think this is an old wives tale.
I have used left over carrier armour as targets at shooting matches. In one case, hundreds of rounds of all calibers were fired at the front armour off a mk1. The Boyes rifle penetrated as to be expected, and one smaller round penetrated through the armour near where the vision slot was (I'll assume that the cutting process for the slit weakened the armour very locally) but other than those, all any of the small arms did was scratch the paint.
I have also noted the dimples on the right side armour to be very evenly laid out. So, as Micheal said, does anybody have documentation as to what exactly the hardness test was?
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