U.S. Consular Fee Issues on Documents Collection, full documents or large portions, includes RK18 (12), RK21a on partial, RK22 on large part (2), RK24 (10), RK27, RK36 (23), etc., nice variety of consular handstamps incl Havana, Baghdad, Shanghai, Kingston (Jamaica), rare Calcutta (with scarce additional "Subject to Disinfection in the U.S." marking), Tientsin China, Aden, Magallanas/ Punta Arenas/ Chile, Buenos Aires, Nagoya, etc., usual mixed condition, VG-VF, well worth a close look. 

CV. 300-400

RK1/40, 1906/52 Consular Fee Issues Collection, mostly complete on homemade pages and incl RK1-9, RK11-12, RK14-22, RK19a on portion of document, RK24-40, usual assortment of cancels and mixed condition, RK2 natural SE, RK26 crease and pinhole, generally F-VF (Scott $3,364)

CV. 1,200-1,600

RK3/40, 1906/52 Consular Fee Issues Collection, in mounts on Scott pages and incl RK2-5, RK11-12, RK15, RK21 (2), RK24-25, RK27, RK30-38, RK40, usual mixed condition, VG-VF (Scott $1,539)

CV. 400-600

RK10, 1906 $1 Dark violet, Perf 10, dated pen cancel plus small portion of embossed cancel, one of the scarcest Consular Fee items, fresh and Fine (Scott $1,000)

CV. 500-750

RK27, RK33, RK38, 1925/34 50c, $1, $9 Consular Fee, 50c, $1 (1 each), $9 (5) tied on last page of a document by boxed cancel of American Consulate at Birmingham, England with wax seal of same adjacent, $1 corner fault, still a Fine use with the 50c being especially elusive (Scott $382 for used singles)

CV. 150-200