1931, CAYENNE - PORTO RICO First Flight 7.1.31 cover bearing two 5 fr. violet yellowish-green and 50 c. blue olive, cancelled Cayenne 7.1.31 d.s., on reverse San Juan P.R. transit mark and forwarded to Chicago with arrival mark 27.1.31 fine (Muller no.21) (Yvert 120, 130)
