Well, the Spear of Destiny was a treasure of the Holy Roman Empire of German Nation. It was recently analyzed, and under many layers of silver and gold happened to be a typical II century AD roman spear point. There are a lot of objections out there to such attributing of this spear, so I'm sure one can find something using google. Btw, the first objection against this relic, as well as many others was made by Martin Luther.
Concerning the swords of David - it's hard to believe that the man who is not survived by a single stone (his tomb is as controvercial as the borders of Israel during his reign) can be survived by 2 swords, in such a great condition. Well, there are actually two stones people attribute to his reign, but that's it.
The reason for multitudes of davidian items appearing in islamic countries is more related to the desire to have a connection to David and other "islamic" prophets of old, and the desire to be seen as "true" continuation of old beliefs.
Rehilting is a catastrophe, for the hilt is the only thing made from organics (wood) - proper dating now is impossible.
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