Scotland Yard on Wednesday issued a photo of a man they would like to speak to in connection with the assault, which is being treated as a hate crime.
The man was in Kingsbury Road, Wembley, on October 13 when he was approached by a group of men who “asked whether he was Jewish”, said the Met Police.
He moved away and tried to take a photo of the group, which reportedly prompted one of them to return and punch him in the face.
PC Catherine Brady, leading the investigation, said: “This assault left the victim incredibly shaken and we know it has caused concern within the wider community.
“Hate crime of any kind is not something we tolerate and we have been carrying out enquiries to establish who is responsible for this offence.”
The incident comes as new figures reveal antisemitic hate crimes recorded by the Metropolitan Police in the wake of Hamas’s October attack on Israel were more than 13 times the number for the same period in 2022.
A total of 679 antisemitic offences were recorded by the Met Police from October 7 to November 7 2023 inclusive, compared with 50 in the equivalent period the previous year and 81 in 2021.