unmounted mint Block of Four 1937 China Mail Provisionals, narrow spacing 2½f. on 2f. variety surcharge inverted, block of four, unmounted mint. S.G. 108a, Chan MK104a, £800
unmounted mint Block of Four 1937 China Mail Provisionals, narrow spacing 2½f. on 2f. variety surcharge inverted, block of four, unmounted mint. S.G. 108a, Chan MK104a, £800
unmounted mint Block of Four 1937 China Mail Provisionals, narrow spacing 2½f. on 2f. variety surcharge inverted, block of four, unmounted mint. S.G. 108a, Chan MK104a, £800
