C2, The 16 Cent Air Mail of 1918, Original Gum Never Hinged

C2, The 16 Cent Air Mail of 1918, Original Gum Never Hinged

C2, The 16 Cent Air Mail of 1918, Original Gum Never Hinged

C2, The 16 Cent Air Mail of 1918, Original Gum Never Hinged