cover 1929 (Feb.) homemade envelope from the Aden Railway Office to New Delhi, bearing Official 1a. tied by a fine strike of the double-ring d.s. with "killer" band (KD3), Aden and Special Inspectors Foreign Mail c.d.s. on reverse; scarce and unusual. Also four pieces with c.d.s. Types KD2, KD3 (2) and DY1. Photo for first