Guinea - Conakry 1966 UNESCO Hydrological Decade 25f imperf proof pair with spectaculat shift of red, unmounted mint
Guinea - Conakry 1966 UNESCO Hydrological Decade 25f imperf proof pair with spectaculat shift of red, unmounted mint
Guinea - Conakry 1966 UNESCO Hydrological Decade 25f imperf proof pair with spectaculat shift of red, unmounted mint