Wow! Thanks for this article -- you just took me back to memory lane, 2005 in particular. I first learned about these stones in an AWAKE magazine issue.
Yes, the similarities are striking, but the most poignant one for me is that when iron tools became available to the Islanders in the 19th century and made the production of these stones easier and less painstaking, the Islanders still reposed much faith and value in the coins minted in the traditional painstaking way, so value was proportional to difficulty of acquisition.
So many similarities between the ancients and us modern people. I guess at the end of the day, concepts underlying mechanisms remain unchanged. The only thing that changes is the method of implementation.