J1, J4 (D1, D4) 4 Jan 1935 cover with 1d and 4d grey-black Postage Dues tied by "NKANA" cds on back of underpaid incoming cover from "LATVIA" franked by 7s blue, re-forwarded from within Northern Rhodesia from Nokola to Nkana, violet "T" tax handstamp, 4d is a well centered bottom margin example, an exceptionally scarce and interesting cover.
