The building Clock, which sits in a clock tower above the Balmoral Hotel, is stopped running after pictures sent to the Evening News this morning captured the clock showing 6.25 at around 7.45am.
It cannot be fixed due to lockdown, but the reason why it has stopped is a mystery.
The clock has been controlled electronically since being converted from manual control in the 1970s, and rarely breaks down.
In 2012, the clock ran 90 minutes late due to a power cut caused by the tram works on Princes Street, and in 2014 it stopped working altogether for the first time in 108 years, seemingly inexplicably.
The reason behind the current stoppage, however, is shrouded in mystery.
The owners of the clock and the hotel, Rocco Forte Hotels said they were aware the clock had stopped and had notified the company in charge of maintaining the clock.
They added the company was unable to tend to the clock and fix the mystery stoppage due to the lockdown restrictions.
