Large Egg Found in City Garden

Hi There! Hoping someone can help after much time spent Googling with no success. A family member found this egg on our lawn (in front of a small woody area) and am struggling to identify it. It’s quite large at 5cm long (seen next to a hen’s egg). Have no idea how it got there as it only seems to have a v tiny crack? I’m hoping this isn’t daft - our neighbour keeps hens although they’re currently being ‘hensat’ elsewhere and the size, colour, speckled markings and pointed shape are different? Any clues? Many thanks.