Acme Supply Company, Buffalo, N.Y., May 13, 1898. Type B44 involute flag cancel on cover franked with 6¢ small bureau; cover slightly reduced at left and a few minor edge faults, an Extremely Fine strike, the only known on this date and the earliest Type 44 involute flag cancel, very rare (Langford CV $2,500). Estimate  $1,500 - 2,000. $0 (Image)