The eagle has two heads instead of one, for example, while the flag emblazoned on the animal's chest is a different shape.
The individual responsible, a member of TPUSA's AV team, was let go in the wake of the incident.
"I'd say it's pretty emblematic of the entire administration", Leazott, who lives in Virginia, told Forbes of the incident. Neither the White House nor Turning Point knows how it got there or who created it.
The U.S. presidential seal features the president's coat of arms, as well as a one-headed eagle holding arrows in its talons, and a ring of stars and words including the U.S. motto, "E pluribus unum", or "out of many, one".
The doctored seal was shown briefly as the president took the stage.
As the Washington Post notes, the image behind Trump at Tuesday's rally was switched to the real presidential seal for the majority of his talk.
Since the well-executed joke was detected, neither the White House nor Trump himself have officially commented.
The fake seal appears on items sold on Inktale.com by seller "OneTermDonnie".
The presidential seal displayed on a giant screen behind President Trump as he addressed the conference had been mysteriously doctored, to show what appeared to be a Russian imperial eagle clutching golf clubs.
In that seal, the eagle clutches golf clubs and what appears to be a wad of money in its talons.
A spokesperson for Turning Point USA, meanwhile, told the paper he was stumped as to the origins of the image, characterizing it as "a last-minute A/V mistake".
Both the White House and Turning Point USA said they were unaware of why or how the altered image appeared on the screen. He said the mistake probably came from the team that handled the event's audio and visual production. "I think it was as simple as a rushed move throwing up an image, and it was the wrong one", the spokesman said, adding it was unfortunate that the faux seal drew attention away from the event's star-studded lineup of conservative speakers.