These cast iron bollards in Hoxton, east London, must be among the smallest and most unusual structures to be listed this year.
Last month the Department for Culture, Media and Sport officially recognised the importance of these rare, mid-19th century pieces by awarding a Grade II listing to the bollards.
Following the Napoleonic wars the fashion for adding modified ships' cannons to the streetscape was all the rage.
However, the bollards in Ivy Street are actually copies cast at the local Bailey Pegg & Co iron foundry and come complete with fake cannonballs in their muzzles.
Surprisingly the Hoxton bollards are not the only ones in the area to have been listed.
The AJ understands that about 15 similar structures in the borough of Hackney have also been given statutory protection.
Yet the number of listed bollards is on the decline, mainly due to road accidents.
A spokesman for the council's conservation and design team said: 'We have lost a few to traffic in recent years - but there is not a lot you can do about it. They are all unique in their own way so we can't really replace them. However, the council is working hard to conserve its heritage for future generations.'by Richard Waite