Postage Due stamps. 1906, Numerals, 2c violet, left sheet margin block of four, full type ''D'' lathework, neat cancellation, light bend at top left on margin, fresh, VF and rare, according to Unitrade only four stamps of #J2 are known with ''D'' lathework, this block is probably unique, C.v. CAD$6,000 for unused block, Est. $1,200-$1,500 (Image)