Lot 40119 – 1930 Cover bearing the second largest multiple of the inverted 1L on 6L surcharge

1930 (Nov 25) Registered cover to Bratislava, franked by Bunavad airmail 1L on 6L with strip of three with inverted surcharge, accompanied by a regular-surcharge example, together with other Bunavad airmail or regular values, all tied by Rousse cds’s; the second largest multiple known of this famous Bulgarian variety on cover (two items are recorded bearing a block of four); a significant key item of worldwide airmails.