The surviving Huddesteen at Eenhoornsluis

The 1684 Huddesteen marker remains set into the masonry of Amsterdam’s Eenhoornsluis, its carved inscription visible. — The surviving 1684 Huddesteen at Eenhoornsluis, photographed 7 January 2012. Hans Erren / Wikimedia Commons, CC BY-SA 3.0. Original composition shown without crop.

What the sources establish

Amsterdam says Hudde had measuring stones installed in locks from 1682.
Measurements established Amsterdam Peil in 1684.
The Eenhoornsluis Huddesteen survives.
The inscription says the sea-dike height is nine feet five inches above town datum; the horizontal line therefore sits about 2.67 metres above Amsterdam Peil.

Evidence limits

The groove is not described as NAP zero. This page does not claim that the stone moved, give an unsupported survivor count, or promise current access or condition.

Sources

1
Amsterdam City ArchivesAmsterdam Peil and the Huddesteen (opens externally)
2
RijkswaterstaatHistory of NAP (opens externally)
3
Stichting NAPNAP history (opens externally)

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