The first coin is supposed to be an AV hyperpyron of Michael VIII Palaeologus. The coin is supposed to be gold but from the image you coin looks silver. The type is supposed to be Sear # 2243. This is a valuable type if real. I think yours is a copy.
The second coin is supposed to be an AV histamenon of Basil II, again the coin is supposed to be gold and this looks silver, similar to Sear 1800, again a valuable type if real which this also appears to be a copy.
On the second coin I just noticed on the obverse that it is stamped 925 which confirms that its a copy. I'm sure if you look more closely at the first coin you will find a similar mark there too.
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