Harold de Polo
3 appearances across 3 restored issues — every one readable in full, free.
Argosy All-Story Weekly, 4 February 1922 — 1922 “The Winning Punch” · p.432 Read the full issue (180 pages) → 
Argosy All-Story Weekly, February 4, 1922 — 1922 “The Winning Punch” Read the full issue (178 pages) → 
Argosy All-Story Weekly, May 3, 1924 — 1924 “Spikes and Six-Guns” · p.856 Read the full issue (186 pages) → Appearances are extracted from each issue's own printed contents page; entries we can't read confidently are withheld rather than guessed.