Canada, Back-of-the-Book Block Stock, good to better blocks in dealer pages, mint never hinged with the occasional used; starting with airmails to #C7 including mint #C2 (cat $560) and a couple C4 blocks (cat $280 each), nice run of Special Delivery blocks from #E3 to E10, good sections of Dues and War Tax, later Official issues including better plate blocks including matching corners; bright fresh material with modest to moderate duplication, catalog Scott $7,138 plus Unitrade C$1,682. Estimate  $2,500 - 3,500. $0