Thanks for posting the digital X-ray pics, Ian!
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				I believe the pictures show that this is not a flat tang, nor a square tang.
			
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 Actually, I'm inclined to believe that this tang is close to square (with some tapering along its length) since the tilted pics (30°/60°) appear to show a slightly thicker tang than in orthogonal orientation (0°/90°).
Regards,
Kai