J6c, J6 (D10a, D10) 1929 18¢ black on orange Postage Due typeset, rouletted 10, VARIETY - "cent.s" for "cents.", only occurred once per sheet of 10 (row 4, pos 1) of the initial printing, unwmkd, top stamp in bottom left sheet-margin vertical pair with normal, rare and undercatalogued, light double-ring "Zanzibar" cds, scarce.
