Just curious to see what people would pay for this, or what you think it is worth? These are all coins from the Song Dynasty 960-1100 AD, and from a shipwreck that occurred sometime around 1100 AD.
I think your item has appeal to a small niche of collector, but without a certificate it is anyone's guess or opinion where it came from. If the coins do not have any Numismatic value. Its just a bit of a conversation piece. JMO
A CoA or other pedigree will help push the value of this up (between $40 & $500 at a guess). Without that, I wouldn't pay more than $20.