Lot #49 QUEEN-ON-THRONES - LITHOGRAPHED BY CAMPBELL & CO: Stone 1 comprising Pane (i) [11] and Pane (ii) [20] [37] & [39], all with full margins. [Geoff Kellow at page 73 states "This is easily the scarcest of any of the printing stones...Only about 160 copies of this stamp have been found, covering 70 of the 100 positions...". Jim Johnstone's remarkable holding of 57 examples sold for $5290, or an average of $93 per unit] (4)