Collection of "Z" Overprints and Monogram Surcharges

1919-20, 275 mint stamps, representing practically complete unit for the period with missing only surcharges on Romanov Dynasty and three not important values, one stamp looks questionable, all others are fully legitimate, nice collection in every respect, full OG, mostly LH, VF, C.v. over $5,300 for listed stamps (website photo)
Click the numbers below to see additional images:
2, 3, 4, 5, 6, 7, 8, 9

1920, Paris issue, Coat of Arms, 10r dark blue, 15r violet, two stamps with strongly misplaced perforation, part of OG or unused, no gum, VF

75.00

1920-22, 100 mint stamps, representing complete Paris, 1st Constantinople and Soviet issues, nice range of surcharges on the Soviet and 2nd Constantinople issues, just a few stamps are questionable, practically all surcharged values expertized, fresh quality unit, full OG or no gum as issued, VF, C.v. is over $1,300 (website photo)
Click the numbers below to see additional images:
2, 3, 4, 5, 6

300.00

1923, black error surcharge (tall thin numeral) "2"(k) instead of "1"(k) on 1st Constantinople stamp of 250r ultra, full OG, previously hinged, VF and very rare unrecorded variety, expertized by Dr. Jemtschoujin
View enlarged fragment.

500.00

1923, double black surcharge "3"(k) on 1st Constantinople imperforated stamp of 3r carmine rose, full OG, VLH, VF and scarce, J. Stolow guarantee hs

100.00

1922-23, 32 mostly mint stamps (two - used), including scarce surcharges "50" and "50k" on Ararat Mountain of 25,000r in blue or brown, all stamps are properly expertized, nice and fresh group, full OG, mostly VF, C.v. is about $2,000 (website photo)
Click the numbers below to see additional images:
2, 3, 4

500.00