SPECIALIZED COLLECTION: 1920-23, 36 mint stamps, including complete set of #C4-8, ''key'' stamps have the A. Teetsov perforation (expertized by him) with extra red 20m/5m+5m, others - mainly black surcharge 10m on imperforated 5m+5m, representing plate varieties of basic stamps and surcharges, neatly identified on stockpages, full/large part of OG, NH or LH/hinged, mostly VF, C.v. $1,650++, Est. $600-$800 (Image)