Amsterdam River Objects

Image: Daniel O'Connell signet from circa 1820-1850.

While excavating the Amstel river during the building of the North/South metro line in Amsterdam, archaeologists catalogued over 700,000 objects dating back to the 14th century ( and some shells from 124,000BC).
The list of objects is searchable via a website and a quick search for Ireland yields some coins and a Daniel O'Connell signet ring from the early 19th century.
Apparently O'Connell was ideals were embraced by Amsterdam activist Pieter de Vos, who wanted to unite the workers of Amsterdam, using O'Connell's rights campaining successes as an example.
Unforuntately, the Amsterdam revolution never happened.