The black and white image has recently emerged online, capturing the hustle and bustle of a busy New York City street.
The Sun reports that the image was captured by an American photographer in Brooklyn’s Union Square in 1936.
However, one passer-by particularly stands out in the snap due to doing something that was out of the ordinary at the time the image was taken.
The man who is seen in the foreground of the picture is seemingly holding a mobile phone to his ear, a device that was not widely available until the 1980s.
The revelation has sent conspiracy theorists on a fact-finding spiral, with some suggesting that the man in question is a time traveller.
While this could potentially be the case, the man could also be holding something else to his ear, or even just scratching his head.
However, this is not the first time a 'mobile phone' has been spotted in an image which was taken before the handheld device was invented.
Footage from 1938 also backed the theory that 'time travel is real', according to commentators.
In the film clip, a group of people are seen walking towards the camera, with one young woman standing out as she's holding something to the side of her head.
The woman in question is seen chatting as she walks in the crowd of people, with the 'device' clamped to the side of her head with one hand. She then seems to lower it before the film clip ends.
This has left conspiracy theorists questioning whether the woman was talking on a mobile phone, or whether she was holding another object to her ear.
Theorists then delved deeper into the claim, with one Youtube account stating that the woman in the footage was their great-grandmother, and she was in fact using a mobile phone.
According to YouTube user Planetcheck, the handheld device is an experimental wireless phone developed by industrial giant Dupont at their factory in Leominster, Massachusetts.
“The lady you see is my great-grandmother Gertrude Jones,” the user said.
“She was 17 years old. I asked her about this video and she remembers it quite clearly. She says Dupont had a telephone communications section in the factory.
“They were experimenting with wireless telephones. Gertrude and five other women were given these wireless phones to test out for a week.
“Gertrude is talking to one of the scientists holding another wireless phone who is off to her right as she walks by.”
In another mind-boggling image, a 1670 painting by Dutch painter Pieter de Hooch shows a quaint domestic scene, with one of the subject's holding what looks like an iPhone.
The supposed image of an iPhone - painted centuries before the devices were first created - can be seen in the hands of a man standing to the right of the picture, according to conspiracy theorists.
