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What I don't know is whether many should be submitted to NGC for grading.
This can be a difficult decision.
99% of ancient collectors are not interested, indeed many hate slabs and grades assigned by anyone other than themselves, there is not a single pricing book that is considered anything more than 'interesting'. Pictures are freely available today (yours are very well taken) unlike the past when grades were often relied upon. Today its only really the 'ancient' Ancient collectors that use grades as 40 or 50 years ago it was an important factor

Ancients that I have seen slabbed by the 'big three' often have woefully inadequate descriptions stating little more than the Emperors name and a reign date. I have even seen a number of ancients mis-attributed in slabs, unforgivable in my opinion. Even beginner collectors could add detail to this info and its led to many seeing the practice as a bit of a joke.
I have nothing against buying coins in slabs but all to often I see $30 coins being offered at $60 as the seller needs to reclaim the slabbing fee. I'm not prepared to pay this extra amount just so I can smash the slab when the coin arrives.
However, many of your coins are 'high end' and certainly to some collectors a form of authentication will give them a warm feeling before they bid or buy, a slab could provide this, certainly to collectors crossing over from US collecting. Another option is David R Sear:
http://www.davidrsear.com/certification.htmlWell respected in the area and a name the vast majority of collectors know and trust. A $50 authentication fee for a coin worth $2000 is, in my opinion a sound investment.
I suspect the prices your asking would only be met by newcomers to Ancient collecting and you would need something like a Sear certificate to help justify the price. Its unlikely experienced people would pay the extra, they can spot the fakes themselves and navigate what can be a minefield to the newcomers. You need to sell the coin plus peace of mind, not just the coin to get the prices you want.
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The Ancient market appears to be a bit different.
It is - take everything you know about collecting
US coins and pretty much forget it or reverse it, sorry.
I often feel the US market is driven by the The
Red Book (and other guides) rather than the book written about the market.
I want a particular coin, find the coin for sale, check the book, bid accordingly.
Everybody else bids accordingly and the coin sells for around the stated price.
The ancient market is so huge and the collectors so varied that this does not happen, the only way to get an idea of value is to see what coins have sold for in the past, even then it can fluctuate for seemingly unknown reasons. In an auction environment a coin could sell for $10 one day and $100 the next.
This is not to imply the Ancients market is wild, its not, just that with maybe 1,000,000 coin types not everyone is looking for yours at that time and everyone acepts that they can never own 'one of everything'.
Wow - never intended to end up with such a long response, hope some of it helps!