Cover with printed 'Howaldt & Vollmer (Pty) Ltd., Windhoek' illustrated 'Bicycle' advertising cover franked with 1931 1d indigo & scarlet and 1937 4d black & purple (SG 75 & 102) tied by WINDHOEK cds dated 12 DEC 1928. Addressed to SWAKOPMUND with arrival cds on reverse. Very attractive