[SetBuilder]

Definitely an autopen. I sent a TTM request to Bill Gates when I was a kid and he sent me back a glossy signed photo and a signed letter on Microsoft letterhead. I discovered both were autopens years later. I'm sure Trump's staff handles all TTM requests as a courtesy to his fans.

Also, this signature is probably a stylized version of his real signature, made to look nice. They took all the elements of his full signature and created an archetypal version for the autopen machine. Think of Arnold Palmer's signature on his golf courses, Ronald Reagan's signature on the cover of his autobiography, etc. His real signature would be much sloppier and differ a bit more from known examples. His campaign trail signature was basically a line of zig zags.