USTSYSOLSK: 1872-1917, the remarkable and valuable study collection (over 350) concentrating on the reconstruction of settings and sheets with numerous multiples and varieties, including 1872 3k. black on yellow (minor faults but of fine appearance), 1874-77 2nd printing 3k. black on red (8, with a block of four) and 3rd printing (3 types, two cancelled by pen cross; 5.5; R), 1877-78 1st printing 3k. with thick border on thick glazed paper (8, comprising seven different types and one with pen cancellation), 4th printing (not listed by Schmidt) (9, including a horizontal pair) and 5th printing (14, including one showing "K" on its side and a block of twelve), 1882 (Apr.) 2k. black on dark green (15, including a reconstructed setting with blocks of six and five) 1883 1st printing (22, including a block of nine) and 2nd printing (39, with two blocks of nine) and later issues including 1917 5k. on 2k. and twelve covers including unused stationery (3)