Mongolia, 1926, $1 brown & salmon, "Postage" overprint in violet, o.g., very lightly hinged, bright and exceptionally fresh, Very Fine and choice, a very scarce and seldom offered issue, grossly under-cataloged in Scott; with 2014 Roumet certificate. Scott Nos. 22 $550. Yvert Nos. 14  €1,400 ($1,930). $0 (Image)