Close, but no cigar
Here is a photo of a spectacular N.Grange Sole Agent for Pacific Coast flask. It was recently dug in the Western U.S., and is almost 3/4 there! There are only 2 known intact examples of this flask, and only one is mint. This is the second version of this flask with the NG version dating from the mid-to late 1870s, and this variant dating to perhaps 1880 or so. This is about as close as one can get! If mint, it would command MAJOR dollars if sold. Keep digging! You never know what will turn up.