John Tyler. Free frank
"J. Tyler" on blue folded cover to West Concord N.H., red "New-York
Sep. 30 Free" circular datestamp, addressed in his hand, fresh and Very
Fine (Image) 
James K. Polk. Free frank
"Free J. K. Polk" on folded cover to Newport N.H., red wax seal on
back with clear "J K P" initials, Very Fine, carried outside of the mails,
almost certainly a presidential frank (Image) 
Millard Fillmore. Free
frank "Free M. Fillmore M.C." as member of Congress on folded cover
to Albany N.Y., red "Washington City D.C. Apr. 19" circular datestamp and
matching "Free" handstamp, Very Fine (Image) 
Franklin Pierce. Free
frank "Free Frank. Pierce" as Senator on 1839 folded letter to N.H.,
red "Concord N.H. Aug. 16" circular datestamp, faint vertical file fold,
Very Fine (Image) 
James Buchanan. Free frank
"Free James Buchanan" as Secretary of State under Polk on folded
cover to Sam Hood in Philadelphia, red "Washington City D.C. Dec. 14"
circular datestamp and matching "Free" handstamp, faint toned spot at
bottom, Very Fine (Image) 
Abraham Lincoln. Free
frank "A. Lincoln" on cover addressed in his hand to Rev. Z. P.
Wilds in New York City, "Washington D.C. Jun. 21, 1862" double-circle
datestamp, cover opened roughly at right but not affecting
signatureVERY FINE. A BOLD LINCOLN FREE FRANK APPLIED DURING HIS TERM AS PRESIDENT.
Accompanied by die sunk portrait of Lincoln. (Image)
Mary Todd Lincoln. Free
frank "Mary Lincoln" on mourning cover to Mrs. Rhoda E. White in
Suffern N.Y., light strike of "Altoona Pa. Aug. 20" (1868) circular
datestamp, faint toned spot at bottom leftVERY FINE. A RARE FREE FRANK OF MARY TODD LINCOLN, WIDOW OF PRESIDENT ABRAHAM LINCOLN.
Mrs. Lincoln visited a health resort, called Cresson Springs, near Altoona Pa. in the summer of 1868, approximately three years after her husband was assassinated. This cover is addressed to the wife of James W. White, a prominent jurist and newspaperman, who was a close friend of Mrs. Lincoln.
Accompanied by period photo of the Lincoln family. Illustrated on p. 154 of Free Franking of Mail by Edward Stern. (Image)
Andrew Johnson. Signature
as President at bottom of green illustrated Aug. 13, 1866 First
National Bank check for $563.46, with 2c perforated Bank Check stamp at top
right, fresh and Fine (Image) 
Ulysses S. Grant. Cover
with "Executive" and "Secretary" imprint, addressed to Attorney General
Judge Edwards Pierrepont in the hand of President Ulysses S. Grant,
sent after free-franking privilege was abolished in 1873 and correctly
stamped with 3c Executive (O12), circle of wedges cancel, "Long
Branch N.J. Aug. 25" (1875) circular datestamp, accompanied by a
three-page autograph letter signed by Grant, cover with diagonal
crease passing through bottom left corner of stampFINE. A RARE EXAMPLE OF PRESIDENTIAL MAIL AFTER THE FRANKING PRIVILEGE WAS ABOLISHED AND OFFICIAL STAMPS WERE INTRODUCED.
Fewer than five examples of the 3c Executive are known used from Long Branch, which was Grant's summer home. The enclosed autograph letter signed by Grant is dated July 8, 1875, and reads (in part): "I am in receipt of your letter of yesterday speaking of the complaints against Judge Fisher, Dist. Atty. for the district of Columbia. I have no doubt but the good of the service demands a change. You may notify Judge Fisher of the fact and give him an opportunity to resign. The change will be made whether he resigns or not..." It is uncertain whether or not the letter was mailed in this cover, because of the lapse between the letter and postmark dates. (Image)