S.S. "Empire,". Violet straight line handstamp on uncanceled 1874, 3Ā¢ green entire to Port Discovery, W.T., with Wells, Fargo & Co. black frank at top and San Francisco violet oval date stamp on reverse; cover reduced at left, Very Fine and choice, a rare express usage aboard the Steamship Empire. EstimateĀ $400 - 600. $0 (Image)