cover 1889 (21 May) envelope to Germany, bearing 1887 perf. 12x11½ 1d. yellow-green and 2d. yellow tied by Apia c.d.s. (Type 1) in blue, in combination with U.S. 5c. tied by cork obliterator, backstamped with San Francisco transit d.s.; the envelope with some faults, mainly at top, which affect the adhesives. Rare. Photo