Hi,
Pleased I was able to find your coin, although I probably didn't give you any information you didn't already know. Seems there's honestly just not much information to be gathered about that item. If you were desperate to know more about the technical side of the item, then there is an e-mail address on page 3 of the catalogue. That's probably your best chance of getting any more information about the replica itself that's not visible on the COA.
If you're wanting to learn more about the original coin of which the replica is of, I think it's probably closest to this one here: N#34551
There's a few tetradrachm in that era that look similar artistically - seems to have been the standard design of the Attica “Athens” Mint from ~550BCE to ~100BCE. These can be seen here: https://en.numista.com/catalogue/index.php?e=attica_section&r=Tetradrachm&ct=coin&im1=&im2=&tb=y&tc=y&tn=y&tp=y&tt=y&cat=y&ru=&ca=3&no=&v=&i=&b=&d=&ie=&u=&a=&dg=&m=1&f=&t=&w=&mt=&g=&se=&c=&wi=&sw=
With it being such an ancient coin, there's not a massive amount of information to be gleaned from it. The owl is a symbol of Athena, patron goddess of Athens, and she herself is the face on the other side. AOE apparently translates to be “Of the Athenians”. With it being a fairly large value coin, and being made in silver, it also puts the wealth & power of the Athenian state for all “foreigners” to see. It's sort of a big PR coin - “Look at how great the Athenian state is. We're rich & powerful because we have the (implied) approval of Athena.”
Afraid ancient coins aren't really my area of expertise, so I can't offer any “recommended reading” or anything else.
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Adding it to the Exonumia catalogue. Honestly, exonumia isn't really my thing either. So far as I'm concerned, it certainly fits the criteria and if it was going to be added anywhere, that's the place to put it. Would I go through the effort of adding it? Personally, no. Odds are you're one of a very few people who own it, and even fewer of those people are on Numista, and perhaps fewer still would actually use the page you've created. Feels like a lot of effort when you might be only person in the world to use it. Suppose it depends on whether you're as lazy as I am! 😛
However, if you want to be able to add it to your Numista collection, then I wouldn't have any objections to you doing so. I guess I'd file it under “Souvenir Medals” → “Replicas”, which is where all the reproduction coins live.
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I do hope that I've been of some assistance to you. I think I've given you as much help as I can, anything beyond would be too specialised for me. I'm sure if you asked on the forums, there would be some Ancient Greek specialists (or at least, enthusiastic amateurs) who'd be more than happy to talk history with you or recommend where to look for information on the historical significance.
P.s. Sorry if I offended you talking about the silver content. One of my friends accidentally got into some trouble selling a “pure” silver necklace online when it was “only” sterling, and didn't want that to happen to you. Re-reading my original message looks a little condescending and that wasn't my intention!