That's amazing coin!!!! And evenly toned! I wish you keep it to the end. It's not sea turtle as I see. One of the best examples I ever saw!
I believe its an older coin from AntiquaNova , not the silver one , but the tin one, these are nowadays 21mm , mine is 24 mm, over time they develop a nice cabinet toning. I bought this one with a lot of others in a lot from an eBayseller. Paid $3 a piece, it didn't fool Bing but TIF nailed it , congrats (from my black cabinet picture)
I forget where I read this but I recall the Sea Turtle was replaced with the land tortoise when Aegina was defeated by Athens and lost their navy. Remember the AntiquaNova fakes in tin are not marked with the S so not seeing scraping in this area just means the coin is not one of their real silver ones.
Heres an older pure silver one, nice toning,without the S, it can probably fool many collectors. Wonder how many are already in peoples ancient collections ?
Well fortunately Kunker is a very reliable firm. I have no doubt that if further tests show that the coin may be non-ancient, they'll have no problem taking it back. If you ever get a metallurgical analysis done, I'd like to know about the silver % and trace elements. I'd guess if this was a counterfeit, then it'd have to be a counterfeit die. Thus it'd be extremely expensive to make just one? I haven't seen any others showing this exact die before which one would expect were it a counterfeit. The verdigres up around the turtle's head also appears to be thick enough as to be very hard to do recently.
Actually as results from 2017 NYINCS come in I've seen a lot of very inferior pieces (Tortoises) bringing good sums. Your coin is very exceptional. Also seems that I haven't gotten much or anything so far out of NY, but then it appears that coin prices are really taking off. Everything is really bringing super high sums: not at all like NYINCS in 2016!
Awesome coin! The fact that there were any Aeginetans left to mint any coins at this time is remarkable. After Athens exiled them from Aegina in 431 BC the Spartans resettled them near Argos in a town called Thyrea. When Athens attacked and burned the city in 424 BC they resettled the non-Aeginetan inhabitants to islands throughout Ionia but had every Aeginetan prisoner genocidally put to death. After the war the Spartans allowed the handful that escaped to resettle thier island.