The arms grant is an Irish one granted in 1938 and listed   G.O. MS. Folio 97
The arms appear to have been in the family for many years and not registered.
John Gordon Buchanan is shown as son of John Buchanan of Dewsbury in Yorkshire and grandson of George Buchanan Esquire, third son of Beaver Buchanan Esquire.

Surveyor of Excise at  Strangford and Downpatrick.

I have located a Dr. George Buchanan of Downpatrick who was  a surgeon to the Royal
Infirmary Co. Down, who appears to be connected with the family of Dr. George Buchanan of
Fintona, and further I have located a Beaver Buchanan of Fintona born 1710 descended from
William Buchanan last of Blairvockie who settled in Ireland.  Blairvockie is a small farm located near the shores of Loch Lomond.

The arms are as follows:
Or, a lion rampant Sable, armed and langued Gules, within a double tressure flory and
Counterflory Azure;  for Crest, on a wreath of branches of laurel, disposed orleways proper,
Mantling Gules, doubled Argent. 
For Motto:  Audaces  Juvo

John Gordon Buchanan (1896, Dewsbury, Yorkshire -1956, Rushen, Isle of Man), son of

- John Buchanan, agent for jute merchant, (1868, Burnley, Lancashire - 1920, Dewsbury, Yorkshire) [and Hanna Field (1867-1957)], son of

- John Buchanan, internal revenue officer, (1832, Ireland - 1910, , Dewsbury, Yorkshire) [and Susan Ann Donohoo (1843-1888)], son of

- Dr George Buchanan of Downpatrick (c1800, Dublin, Ireland - 1841, Doenpatrick, Ireland) [and Ann Wright (unk-c1843)] son of

- Bever Buchanan, Apothecary of Dublin (1775, Fintona, Ireland - 1813, Dublin, Ireland) [and Elinor Hogson], son of

- Dr George Buchanan of Fintona (1740-1818) [and Ann Mullen], son of

- Beaver Buchanan of Fintona (1710-bef 1804) [and unknown], son of

- William Buchanan of Fintona (unk - 1764) [and Margaret Creely], 2nd son of

- William Buchanan, 3rd and last Laird of Blairvockie (unknown), 3rd son of

- Walter Buchanan, 1st Laird of Blairvockie (unk-c1632) [and Margaret McAlpin/McAlpine], 2nd son of

- Walter Buchanan, 5th of Spittel [and daughter of Galbraith of Balgair], the son of

- Robert Buchanan, 4th of Spittel [and daughter of Lawson of Bogal], the son of

- Edward Buchanan, 3rd Laird of Spittel [and Christine Galbraith], the son of

- John Buchanan, 2nd Laird of Spittel [and Elizabeth Cunningham], the son of

- Walter Buchanan, 1st Laird of Spittel [and Isabella Cunyngham], the son of

- Patrick Buchanan, the younger of Buchanan (unk-bef 1477) [and Jonet Cunynghame], the son of

- Walter Buchanan of Buchanan [and Isobel Graham].