Collection of 20 lep. x22 (plated) prussian blue on white paper. All 1875-80 issue on exhibition sheetlet. One with inverted keyhole shaped "0" (p. 31) Kound. 63.10.2 and three with uneven C.F. (pos. 17, 73 and 93) Kound. 63.15. Ex Bellas collection. F to VF (Hellas 51a)