497 var, 1989 K20 on K2 Shoebill, Surcharge omitted, sheet of 50 without selvage (removed by P.O.), surcharge shifted left on top three rows, smudged surcharge in 4th row, surcharge completely missing on bottom row, black surcharge ink smudge lines in 3rd and 4th rows, NH, bottom two rows vertical perf separations between column 5 and 6, oner stamp bottom row an ink mark on gum, very fine and likely unique