Not to be confused with the music called "Four minutes, thirty-three seconds" by the composer John Cage (1912 - 1992).
This is Ramsgate, Kent in the UK. The inscription on the old harbour clock tower informs residents that the 'proper' Ramsgate time is 5 minutes and 41 seconds before the time shown on the clock.
The clock shows Greenwich Meantime. This was established as a universal standard in the UK in 1840s.
Before that, various areas had their own time - and some were reluctant to fully embrace the change.