I really love the eagle on the reverse. Its in good condition. I want to know value. Its up for auction but I have no idea where to bid. Thanks
While I wouldn’t want to suggest a value or bid price, I do recommend that you take a look at an open search engine with values such as Sixbid’s https://www.sixbid-coin-archive.com/#/en, or CNG’s https://cngcoins.com/Coins_sold.aspx. By searching under keywords, in your case perhaps “Philip II tetradrachm Antioch” you’ll find many examples of sales results. In this way you'll be able to determine the market value. Have fun!