I started collecting since a short time and even I can see in a blink of an eye that this is fake, and if I'm not sure I look at the weight. I saw one time on ebay a person who sold a drachm and he put as weight 6,5 grams.... and still people bid on it.... I really fail to understand. Apparently this tetradrachm is weighing 2,57 grams: https://www.ebay.com/itm/-/283088319840?nordt=true&orig_cvip=true&rt=nc&_trksid=p2047675.l10137
I wouldn't even need to see the coin, the item description is a field of red flags, blowing in the wind and warning away all but the most easily duped.