Many thanks all. Swordfish looking promising. My only slight concern when comparing it with Swordfish photos is that the Swordfish blades look to be more bulbous towards the tip and more symmetrical in profile (leading edge/trailing edge). Might just be the viewing angle though. Below is a photo of the other blade after cleaning and the two halves welded together (not known if there was a third). Spot the join! The leading edge looks much straighter than the training edge and the taper to the tip is well defined.

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