The Silver Quarrel

Published in Pearson's Magazine (UK - Nov. 1933). Reprinted in Ellery Queen's Mystery Magazine (US - Sep. 1950). Collected in the book The Duel of Shadows.
The famous Argrayth Treasure, dating back to the mid-17th Century remained lost because "no one had deciphered the clues to its whereabouts". Now the last of that line was dying. The doctor hearing the dying man's ranting about the large fortune secreted away comes to Barnabas Hildreth with a request that the man use his talents by solving the mystery.