Colorado Bank Check Group. 1867-1900, 10 checks all on revenue stamped paper, includes 5 1860-70's illustrated checks from The Rock Mountain National Bank (two different designs, one accompanied by N.B.N.Co. proof of illustration), The Colorado National Bank and The Denver Pacific Railway, others including Denver & Rio Grande Railway Co., U.S. Express Co. and Denver Gas & Electric (unused), Very Fine. Estimate $0 (Image)