Lot
2721 
1925, 4¢ yellow brown, 5¢ blue and 6¢ red orange, rotary, tied on special delivery cover by "Washington, D.C., Apr 4 1925" First Day of Issue duplex cancels, locally addressed to the U.S. Patent Office, Very Fine, a rare triple issue first day. Scott No. 585-587; $1,000 Estimate $400 - 600.
Realized: $250