1918 (21 Oct) registered cover from Prekuln to Exin (near Bromberg), franked with Ob Ost overprints, with Registry label "Libau", crossed out and "Prekuln" inserted by hand, fine cover, with arrival pmk (Image)

Est.US$150

1919 (22 Aug) registered cover from Riga to Schleswig, with framed "M.P.k." censor and arrival pmk on back (Image)

Est.US$100

1918 (16 Nov) registered picture postcard ("old German Riga") from Riga to Smolensk, franked with single 20pf Ob Ost overprint, with Registry label, returned with "Zuruck" handstamp and Riga (14.12.18) arrival pmk (Image)

Est.US$150

1919 (12 Apr) registered cover from Leepaja to Berlin, "Libau" registry label, fine Philipp Kosack cover (Cat No. 17-24) (Image)

Est.US$150

1919 Warrior slaying Dragon, 10k, 25k and 35k imperforate horizontal pairs, proofs on wove paper, v.f. (Cat No. 64-66P) (Image)

Est.US$400

1919-20 two covers, one from Riga to Copenhagen with extraordinary franking, the other registered from Libau to Munich, returned to sender with "Zuruck" handstamp, some faults, otherwise fine (Image)

Est.US$100

1923-33 Coat of Arms, 1s-30s imperforate proofs in issued colors, nine horizontal pairs (including two gutter pairs) and eight blocks of four (one vertical gutter block), total of 50 stamps, mostly different watermarks, unused without gum as issued, fine-v.f. (Cat No. 114/148var) (Image)

Est.US$500

1928-33 Triangles, three flown covers to USA, two registered, franked with three different sets of three, including two Air Post Semi-Postals, fine-v.f., with arrival pmks (Cat No. C3-5,CB6a-8a,18a-20a) (Image)

Est.US$250

1933 Latvia-Africa Flight, three different triangles used on registered and flown cover from Riga (28.5.33) to Czechoslovakia, two additional stamps and arrival pmks on back, v.f., signed I.Heiman (Cat No. C9-11) (Image)

Est.US$250

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

1934 "Europa" to New York flight, with two cachets, v.f., with Berlin transit pmk, scarce (Image)

Est.US$900

1928 two flown covers (29.IX and 31.10) from Riga to Brunswick and Berlin, each with Deruluft-Riga cachet, transit and arrival pmks (Image)

Est.US$150

1928 four "Deruluft-Riga" cacheted covers to Berlin, Copenhagen, Moscow, each franked with a set of three, departure and arrival pmks, fine-v.f. (Cat No. C3-5) (Image)

Est.US$250

1920 Red Cross, 40 imperforate proofs on white background, in various colors and stages, eight sets of four, plus additional eight values, some printed on both sides, v.f. and scarce lot (Cat No. B9-12P) (Image)

Est.US$2,500

1925 Liepaja (Libau) Tercentenary, imperforate singles, n.h., v.f. set, cat. $500 (Cat No. B24-28var) (Image)

Cat. $500, Est.US$250

1932 3rd SAF card to Brazil, franked on reverse with 8 Triangles and single 1L regular issue, Berlin-Friedrichshafen connecting cachet and Pernambuco arrival, v.f. (Image)

Est.US$250

1932 9th SAF to Brazil, attractive franking, with Slampe departure, Registry label filled-in by hand, Berlin forwarding cachet, with arrival pmks, v.f. (Image)

Est.US$250

1933 5th SAF card to Brazil, attractively franked on both sides, v.f., with Berlin forwarding cachet (Image)

Est.US$250