Sure thing. I expect it certainly is worth a bit as Stauffenberg is one of the rarest of WWII signatures.
This is the most interesting historical piece in my collection. The photo is of a reunion dinner of 1st Bavarian Heavy Cavalry Regiment in 1929. Stauffenberg's Uncle Berthold was the Colonel in WWI and he has signed as well. The back of the photo is also signed by 4 other officers involved in the resistance against Hitler (von Marogna Redwitz and von Leonrod were executed at Ploetzensee), and Anton Arco auf Valley, the 1919 assassin of Bavarian PM Eisner.
1 Eckart Anton von Pappus und Trazberg Freiherr Zu Laubenberg und Rauhenzell
2 Richard Walther
3 Berthold Schenk Graf von Stauffenberg
4 Ferdinand von Kobell
5 Hans Freiherr von Koenitz
6 Hartmann Maria Frhrr von Ow Auf Wachendorf
7 August Freiherr Teuffel von Birkensee
8 Karl Wilhelm Leonhard Czermak
9 Franz Freiherr von Soden
10 unknown 10
11 unknown 11
12 Stephan Freiherr Reichlin von Meldegg
13 Graf Anton Alfred Emil Hubert Georg Arco Auf Valleÿ
14 Hans Erwin August Friedrich Bresselau von Bressensdorf
15 Oskar Frieherr Kress von Kressenstein
16 Heinrich Freiherr von Koenitz
17 Heinrich Freiherr von Aretin
18 Franz Freiherr Redwitz
19 Leonard (or Hans) Räth
20 Joseph Ernst Hermann Theodor Karl Maria Erbgr. Fugger von Gloett
21 Karl Graf von Moy
22 Karl Freiherr Von Speidel
23 Carl Max Graf Von und Zu Sandizell
24 Ludwig Freiherr von Leonrod
25 Ferdinand Maren Harthard Antoius Michael Josef Prinz von Der Leyen und Zu Hohen Geroldseck
26 Franz Freiherr von Pfetten
27 Albert Freiherr Aretin
28 Robert Karl Banfield
29 Claus Philipp Maria Justinian Schenk Graf von Stauffenberg
30 unknown 30
31 Freiherr von Ribaupierre
32 Otto Freiherr Von Kramer
33 Karl August Friedrich Freiherr von Bonnet Zu Meautry
34 Josef Fries
35 Rudolf Graf von Marogna-Redwitz
36 Karl Georg Bernhard Ritter von Gonnermann
37 Maximilian Freiherr von Mauchenheim Genannt Bechtolsheim
38 unknown 38
39 Ferdinand Graf von Arco-Zinneberg
40 Claus von Stauffenberg's personal stamp
Here's the youtube link to the first part of the German version of the documentary.
Colin