1931 Triangles, three of each, used on registered cover from Riga (27.5.33) to USA, v.f., with arrival pmk (Cat No. CB4-5) (Image)

Est.US$150

1932 Triangles, perf. and imperf. sets of three, used on registered cover from Riga 1.6.33 to USA, v.f., with arrival pmks (Cat No. CB6-8,CB6a-8a) (Image)

Est.US$250

1932 three covers, each franked with a set of three triangles, two perforated, one imperforate, different markings, fine-v.f. (Cat No. CB6-8,CB6a-8a) (Image)

Est.US$250

1932 Leonardo da Vinci, etc., imperforate sheet margin singles, set of five, used on registered cover from Riga (2.2.33) to USA, with New York transit and Detroit arrival pmks on back, v.f. (Cat No. CB9a-13a) (Image)

Est.US$200

1932 Leonardo da Vinci, etc., imperforate set of five, used on registered cover from Riga (20.2.33) to Viipuri, Finland, with arrival pmk on back, fine-v.f. (Cat No. CB9a-13a) (Image)

Est.US$150

1932 Leonardo da Vinci, etc., imperforate set of five, used on registered cover from Aizpute (15.5.35) to Riga, with arrival pmk on back, fine-v.f. (Cat No. CB9a-13a) (Image)

Est.US$150

1933 Airships, imperforate set of four, used on registered cover from Riga (26.IX.33) to Wolfen, Germany, with arrival pmk on back, fine-v.f. (Cat No. CB21a-24a) (Image)

Est.US$250

1933 Airships, imperforate set of four, used on registered cover from Riga (7.IX.33) to Leipzig, Germany, with arrival pmk on back, fine-v.f. (Cat No. CB21a-24a) (Image)

Est.US$250