From an auction webpage (sorry, this is all I could find):
This three-ring checklist (6″x8″) was flown used onboard Apollo-Soyuz by Deke Slayton and has extensive pencil notations in his hand. Pristine condition and unique. Fourteen pages plus front and back cover. A ‘Slayton’ Certificate of Authentication is included and states, in part: ‘This checklist book has been on loan for exhibition to the Astronaut Hall of Fame in Titusville, FL and the Air and Space Museum in Huntsville, AL. Ex-Donald ‘Deke’ Slayton Estate Collection.