A with a hand drawn moustache on his face is wanted by police.
The Met said the suspect, wearing a pink shirt, appeared to be in fancy dress when he attacked two men and a woman at a party at the Tudor Barn pub in south-east London.
The CCTV image shows the man with a curled-tip moustache and ‘soul patch’ tuft of hair below the lower lip.
He is alleged to have head-butted a 42-year-old man, thrown a 28-year-old woman to the ground, and punched a 34-year-old man in the face.
A Scotland Yard spokesman said: ‘The suspect is described as a white man, of large build and around 6ft.
‘He was aged 45-50, spoke with a London accent and had very short hair. A CCTV image released shows him apparently in fancy dress, with a moustache and beard drawn on.’
The incident is alleged to have happened in the early hours of New Year’s Day, although the CCTV image was only published on Tuesday.