ALGERIA: Semi official AIRMAIL issue 2f blue & red inscribed 'Alger-Tunis' and the unissued types with the reverse wording 'Tunis-Alger' 50c dark green on greenish, 1f red on pink & 10f brown on orange all cancelled with ALGER CONSTANTINOPLE cds's dated 1931. (Sanabria #504 & unissued in footnote) (Start Price = £12.00)