OS rivet benchmark - Greyhound Island
Introduction
The photograph on this page of OS rivet benchmark - Greyhound Island by Richard Law as part of the Geograph project.
The Geograph project started in 2005 with the aim of publishing, organising and preserving representative images for every square kilometre of Great Britain, Ireland and the Isle of Man.
There are currently over 7.5m images from over 14,400 individuals and you can help contribute to the project by visiting https://www.geograph.org.uk

Image: © Richard Law Taken: 3 Jun 2023
A slightly clearer photo than Image, and I'd maintain that part of the rivet is still visible. That's not to excuse the clumsy placement of the concrete pad for the fence.