Jim, well argued response, but I'd like to make a counterpoint.
In a 2006 post JeffD showed a kaskara with the three Kull marks, two of which were copper filled. Images attached below.
http://www.vikingsword.com/vb/showth...ghlight=Cronau
The fly is of the distinctive Kull design and distinctively struck. Who would doubt that this is not Kull factory struck? Ariel's mark is the same if not identical, but dirty. The cross & orb and standing cat on both may or may not be factory. (Was all three defining marks always/mostly/often placed on Kull export blades?)
We agree that someone somewhere at some time filled the orb-cross & cats with copper, but not the fly. I would accept somewhere in the Trans-central Africa trade network in the mid to late 19th C.
Best regards,
Ed