Guinea - Bissau 2009 New Technologies (Quantum Mechanics) perf s/sheet unmounted mint Yv 452, Mi 695
Guinea - Bissau 2009 New Technologies (Quantum Mechanics) perf s/sheet unmounted mint Yv 452, Mi 695
Guinea - Bissau 2009 New Technologies (Quantum Mechanics) perf s/sheet unmounted mint Yv 452, Mi 695