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President Donald Trump says a birthday message to disgraced financier Jeffrey Epstein purportedly signed by him is fake, but a series of comparisons with first-name Trump signatures show some similarities.

The House Oversight Committee on Sept. 8 released a 238-page “birthday book” assembled for now deceased Epstein’s 50th birthday in 2003.

Page 165 of the leather-bound book contains a bawdy drawing and a note, “Happy Birthday – and may every day be another wonderful secret,” with Trump’s reported signature.

Learn more: What's in the Epstein book?

Trump has denied contributing to the book. He filed a $10 billion defamation suit against the Wall Street Journal and its owners on July 18 after the Journal reported on it.

In a briefing on Sept. 9, White House Press Secretary Karoline Leavitt said Trump "did not write this letter. He did not sign this letter.That’s why the president’s external legal team is aggressively pursuing litigation against the Wall Street Journal and they will continue to.”

Republican lawmakers have also disputed its authenticity.

But a comparison between the book signature and documents Trump has signed in the past reveals some resemblances.

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An analysis from the New York Times points out that the signature on the letter more closely mirrors others from that time period when Trump only signs with his first name, rather than the first and last.

The birthday note is signed “Donald” with an end flourish. That signature is close in appearance to six other Trump signatures over the years, according to CNN and other news sites:

1984: A letter to A.M. Rosenthal, executive editor of the New York Times.

1995: A letter to a member of a Palm Beach commission.

1996: A letter to then-New York Mayor Rudy Giuliani.

1997: An inscription in a Trump book, “Trump: The Art of the Comeback,” owned by Epstein.

1999: A letter to former CNN host Larry King.

2014: A letter to former MSNBC host Keith Olbermann.

The book is filled with lewd pictures, with many faces blacked out, and messages both handwritten and typed from well-wishers for Epstein’s 50th birthday, USA TODAY reported. While it lists notable figures such as former President Bill Clinton and Harvard law professor emeritus Alan Dershowitz as contributors and "friends," neither they nor Trump has been charged in association with Epstein.

Trump will agree to a forensic review of the signature to prove that it’s not his, Leavitt said.

“We would support that. We have seen many forensic analyses of signatures coming out. I believe it was the Daily Signal that published a piece with three separate signature analysts that said this absolutely was not the president’s authentic signature," Leavitt said.

CONTRIBUTING Bart Jansen, Kinsey Crowley, USA TODAY

SOURCE USA TODAY Network reporting and research; Reuters; oversight.house.gov

This article originally appeared on USA TODAY: Despite similarities, Trump says signature in Epstein book isn't his

Reporting by George Petras and Stephen J. Beard, USA TODAY / USA TODAY

USA TODAY Network via Reuters Connect