California Penny Post Co., 1855-59, 7¢ black. Impressed on U.S. 3¢ envelope (No. U9) and company ad on backflap, addressed to Grass Valley, manuscript canceled with "Forest City, Cal., Jany 19" cds, minor cover edge wear, Very Fine, a very rare usage of Grass Valley. Scott No. 34LU12  Estimate $1,000 - 1,500. $0 (Image)