Greek Large Silver Coin ID Help Please

Perhaps an Ekbatana issue of Seleukos I Nikator. The anchor and monogram match, and perhaps it's meant to be ΣΕΛΕΥΚΟΥ reverse right.

Sadly, has the soapy look of many cast fakes.

30% too light to be authentic

thanks for your replies , had them for a while , purchased from a private seller on ebay , ripped off again , but I have had some good buys over the years . added some edge pictures thanks again dave

I'd recommend against purchasing "job lots" of ancients, especially if they're unidentified. Such lots are almost always either tourist accumulations (all the "ancient coins" for sale in tourist traps like Ephesus are fakes), or a portal for actual fake-makers. And I'd recommend against eBay generally, as far too many fake-sellers get away with it on eBay. There are also other shysters; there's one British eBay seller who will remain nameless; half what he sells are fake, the other half are genuine but common coins that are over-hyped and (falsely) claimed to be valuable rarities.

There are good local sources of ancients in Australia. Romanorum is the ancients specialist I've spent the most money with, myself; they have a mail-order catalogue/website and also attend most of the larger coin shows like ANDA. The bigger big-city dealers like IS Wright and Colonial usually have a good stock of ancients. Smaller dealers are usually hit-and-miss; they sell what they get in, but aren't necessarily experts in identifying fakes.

For overseas dealers, I've frequently bought from FORVM and from Civitas Galleries, both of which specialize in ancient/mediaeval coins.