Stamped-to-order Envelopes: 1917-21 3d Olive Kangaroo envelope for S. Cooke Proprietary Limited, uprated with 1d Red George V for 4d foreign rate from Melbourne to Leipzig, Germany, 17 February 1922. Archival records indicate 1,845 envelopes were printed between 1917 and 1921, probably all for the same firm. Couple of small ink stains at top of envelope, otherwise fine and a major Australian Commonwealth postal stationery rarity, with only four entire envelopes recorded. BW ES8, cat AU$7500