Maybe going a little beyond the subject of this thread...
The only reliable method of dating iron objects is radiocarbon dating.
And this is very expensive and in most cases completely inaccessible.
Even more difficult is dating bronze objects. The few methods used (voltammetric, metalographic, radiocarbon) are very expensive, hardly accessible and do not give very reliable results.
At the same time, various techniques of aging metals are available that give results practically undistinguishable from natural aging processes.
So there should be no surprise that the antique metal objects market is literally flooded with fakes that in some cases can fool the most versed experts.
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