I don't handle greek much, especially Athenian tets... But the obverse color looks wonky, and there is slight reverse granularity. I would proceed with caution.
You can search fakereports for Athenian owls at https://www.forumancientcoins.com/f...Trr262xrCF2GFBdUNSB7icaNJQiBCEdbLsTGNJ71hbF3n
I'm not qualified to answer. I will say that at least it doesn't look like an obvious tourist fake, but the question is, is it a more deceptive fake? I don't know.
The style is correct and there appears to be the high relief you would expect on an Athenian tetradrachm. The weight is low, but that could be due to the damage the coin has suffered. The fields of the coin are unusual. So it's either a cast fake or a badly damaged authentic coin. Not certain which, although I'd lean towards badly damaged and authentic. Having said that I'd not buy this coin, there are lots of better examples around.
Thank you RichardT for your elaborate reply. I had purchased the coin from UK few months back when I flew for some work. The coin was shown to few numist but problem happened after reaching India. There Numist only know the good silver coins normally seen but there were also less silver content coins minted. The side and relief while in hand gives a positive vibe about the coin. The Owl in reverse looks absolutely correct too.
