And here's an example on a letter he wrote to Mia Farrow, presumably in the late 1960's.
And one written to Glenn Ford (Note at the bottom of this letter, it appears to have been dictated to a secretary who's name starts with the letter L, whereas mine was dictated to a secretary with the letter D, for Dorothy Uhlmann, yet the signature is the same). That leads me to believe my letter and this are truly Sinatra's handwriting.
Another example in a letter sent to George Bush in 1990 (note the F and R in "Frank" are now connected, and the T in "Albert" has slightly evolved):
I trust my source that it's a source of Los Angeles. The Hollywood Show since 1979
It very well could be. The elegant, flat topped "r" letters are what concern me in the signature you posted, as Sinatra never signed his full name or "Francis Albert" in that fashion that I am aware of.
Of the two upstairs which convinces you more?
I haven't bought any as these are purchased by a third-party Hollywood Show, not by the Hollywood Show.
I've seen Jerry Lewis signatures in person very different from the ones on the market and that doesn't mean it's not authentic.
I have a signed 2015 Jerry Lewis photograph and it's quite different from the rest and in their own signatures there are different endings, meaning he doesn't sign them all the same.
True, but keep in mind by 2015 Jerry Lewis was 89 years old and pretty frail. I understand that signatures can vary, but a vintage Sinatra autograph should be pretty consistent unless it was very rushed, which that card certainly doesn't indicate any rushing.
What is the signature on the second one?