1840 (21 Nov) FL from Dublin to Ballriggan, franked with 1p black, lettered G-F, margins all around, tied by reddish MC, with corresponding "No21 40/4E" departure datestamp on back, filing fold away from the stamp, fine Penny Black used from Dublin (Cat No. 1) (Image)

Est.US$250

1840 (21 Aug) folded "Whitehaven, Stranraer, and Glasgow" shipping company's schedule from Belfast to Moy, franked with 1p black, lettered J-I, close but clear margins all around, canceled by red MC, with corresponding "Belfast Aug 31, 1840" departure, Armagh transit and Moy (Sep 1) arrival pmks on back, fine Penny Black used from Belfast (Cat No. 1) (Image)

Est.US$250

1841 (4 Feb) FL from Belfast to Antrim, franked with 1p black, lettered B-G, ample margins all around, tied by red MC, with corresponding "Belfast Fe 4 1841" departure, blue Lurgan transit and Antrim (Feb 5) arrival pmks on back, fine Penny Black used from Belfast (Cat No. 1) (Image)

Est.US$250

1859 (16 Feb) small cover from Dublin to Paris, franked with pair of GB 2p blue, tied by "186" duplex, with corresponding departure cds alongside, red London transit on back, French "Amb. Calais" entry and red "PD", fine (Image)

Est.US$150

1907-16 Sinn Fein Propaganda labels, "Celtic Cross" in pale blue, "Hibernia & Harp" perf. 11, wide crown, blocks of four, l.h. at top, bottom stamps n.h., usual centering (Image)

Est.US$250

1912 Imperial Union, 1d emerald green, 1d dull orange, l.h. or n.h., fine-v.f. (Image)

Est.US$150

1920 Dollard House Essays, nine different, many sheet margin singles, perf. 12, l.h. or n.h., fine-v.f. (Image)

Est.US$500

1920 Fiji, 2d George V, imperforate single on gummed, Gaelic "SE" watermarked paper, n.h., v.f., rare (made in 1920 to demonstrate suitability of the Irish watermarked paper for typographic printing, usually canceled with a pen by the printer) (Hibernian E167, Euro 525) (Image)

Est.US$300

1922 1d scarlet, overprint double, both inverted, one albino, n.h., v.f., with photocopy of a 2004 MacDonnell certificate for a block of four from which this originated (SG 2b, £350 as hinged) cat. $600 (Cat No. 2c) (Image)

Cat. $600, Est.US$150

1922 10sh gray blue, l.h., faint natural gum bend, v.f., with 2014 Sismondo certificate (SG 46,£1,000) cat. $1700 (Cat No. 38) (Image)

Cat. $1700, Est.US$500

1922 2 1/2p bright blue, block of four, upper right stamp Accent Omitted variety, n.h., regular stamps h.r., v.f. (Cat No. 48a) (Image)

Est.US$100

1925 2sh6p-10sh Seahorses, wide and narrow date of each, n.h., v.f., cat. $1595 (Cat No. 77-79,77b-79b) (Image)

Cat. $1595, Est.US$750

1932 "Atlantic Air Mail August 1932" four-line overprint in red on 1sh blue, initialed "JAM" (James A. Mollison) on back, n.h., fine, with 2008 Roy Hamilton-Bowen, BPP certificate (Hibernian AO1, Euro 2,500 for hinged; "unmounted mint (never hinged) examples are extremely rare.") (Image)

Est.US$1,000

1932 "Atlantic Air Mail August 1932" four-line overprint in red on 1sh blue, tied by Portmarnock Co. double-circle pmk on cover addressed to Miss. K. Sweetman, Harbour Grace, Newfoundland, some usual toning, otherwise fine (Hibernian AO1a, Euro 2,400) (Image)

Est.US$750

1919 (14 June) cover from Newfoundland, franked with $1 Trans-Atlantic surcharge, canceled by mute handstamp, with Harbour Grace, June 14 cds alongside, endorsed "Via Aerial Post from H.Grace Handley Page", addressed to Ireland, with oval "Atlantic Aerial Mail Handley Page July 14 1919" datestamp on back, with Fairview Dublin 23 July 19 arrival, some cover faults and toning, otherwise fine. Only 19 covers have been recorded mailed from Harbour Grace, each with the Handley-Page datestamp. This may be the only example with an Irish arrival pmk (Image)

Est.US$500

1931 (28 Apr) registered flight stationery entire additionally franked with four adhesives, accepted from Dublin for inclusion on the First KLM flight from Amsterdam to Melbourne, Australia, "Abel Tasman" diamond cachet, Batavia-Centrum (9.5.31) and Melbourne (19 May) arrival pmks, v.f. (Image)

Est.US$250

1932 (18 Aug) First Solo Flight, Europe to North America, legal-size cover carried by Captain James A. Mollison from Portman Co. Dublin to Harbour Grace, Newfoundland, with City Seals of Dublin in gold foil (also one on back City of New York), right one signed by Lord Mayor of Dublin (Alfred Byrne), top center red City Seal of St. Johns (slightly extended, with minor flaws), signed and endorsed by Mollison, fine cover, with 2019 Roy Hamilton-Bowen certificate ("it is believed that 10 of these covers were originally prepared, but only about 6 examples are known today") (Cat No. AAMC 1171b) (Image)

Est.US$1,000

1934 (15 May) attempted flight, New York to Rome by Pond and Sabelli, 8c air mail stationery cover addressed to New York, with Brooklyn departure and arrival cds, signed by both pilots. Due to engine trouble, the aviators were forced to land in Leact Ui Concubair, Ireland (transit pmk of May 15); after repairs were made they continued on to Rome, v.f. (Image)

Est.US$200

1933 2nd SAF to Montevideo, Dublin Registry label at left, red Berlin forwarding cachet and "Servizio Aereo Transatlantico" Condor-Zeppelin applied on arrival in Uruguay, fine (Image)

Est.US$150

1933 Chicago Flight from Dublin to Brazil, attractively franked, with Berlin forwarding cachet, v.f. (Image)

Est.US$250