I found Anthony Sale's very legible signature on the Dec. 5, 1777 petition from Caroline County.As you indicate, on the 1779 petition there are more Sales -- Thomas (twice), Richard, Anthony (again) and Robert.
Of course, from my point of view what would be even better than the signature of your Hannah (Thorp?) Sale would be a signature of Hannah (Jones) Sale Blackburn, widow of William Sale (son of the first Cornelius Sale) ... but this period seems to be perhaps too late in time for her (assuming, as I do, a birth year of about 1698 for her).And of course at this point, even if she survived, she would be listed as a Blackburn rather than a Sale.In any event, women were only a few of the subscribers to the subject petitions.
Some of the "signatures" on these lists are pretty clearly not signatures as such, but just the names of the supporters written by someone else.Otherwise one can't account for places where five or six names in a row are given in exactly the same handwriting.On the other hand, above Hannah's name (lower left hand column, page 4 of the 1779 petition) the names of John White, John Cook, Robert Scananes (?), Thomas Garnett and James Sutter (Sutler?) all appear to be autographs.