George V postbox, Whippendell Road / Park Avenue - aperture
Introduction
The photograph on this page of George V postbox, Whippendell Road / Park Avenue - aperture by Mike Quinn 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: © Mike Quinn Taken: 15 Jan 2020
See Image The metal plate is an aperture restrictor plate. It's designed so that only thin items can be posted in the box. These have their origins in the Northern Ireland Troubles and were designed to prevent packages containing explosives from being posted. Hence they were nicknamed "Belfast Slits". Today they are often deployed to prevent drug users from posting syringes etc.