Thomond 1968 Helicopter 2s6d (Diamond shaped) with 'Europa 1968' overprint doubled, one inverted unmounted mint
Thomond 1968 Helicopter 2s6d (Diamond shaped) with 'Europa 1968' overprint doubled, one inverted unmounted mint
Thomond 1968 Helicopter 2s6d (Diamond shaped) with 'Europa 1968' overprint doubled, one inverted unmounted mint