German Southwest Africa Windhoek with Tree Private Postal Stationery This card became available for use in 1902. It depicts cattle being driven past a tree, with Windhoek in the background. Set Date(s) 1902 Windhoek with Tree Private Postal Stationery This card became available for use in 1902. It depicts cattle being driven past a tree, with Windhoek in the background. Set Date(s) 1902