cover 1922 (10 May) commercial envelope to Switzerland "per SS 'Porthos'" with "CHINA" 1c. (2), 4c. (2) and 10c. (2) tied by registered ovals nad showing a good strike of the second, non-standard boxed registered h.s. at left (Proud R10), reverse shows Port Taufid, Alexandria and Geneva c.d.s; light stain across centre, fine and scarce. Photo