1929, 6¢ Kans. (Scott 664), left margin single, o.g., never hinged, a condition rarity, with immaculate color (not a whisper of oxidation) and centering seldom encountered on this issue, Extremely Fine to Superb, a gem of a stamp, with 2019 P.F. certificate graded XF-SUP 95.
SMQ XF-SUP 95; $375. (Image)

Estimate $300-400