Lot
520 
1925, 4¢ yellow brown, rotary, left margin single, o.g., never hinged, virtually perfect centering amid large beautifully balanced margin, strong bright color and P.O. fresh, Superb, arguably the most difficult rotary perf 10 issues to obtain in exceptional condition; with 2013 P.S.E. Graded certificate (Superb 98, SMQ $800). Scott No. 585 $38.