I believe this was the Maine? Volunteer Militia organized at Augusta, January 23, 1862 and mustered out of service July 5, 1866. The glass flask (5 1/2 tall) is not chipped or cracked.
We described things as best we can but we are not experts in every field. You may know more about the item then we do. Thank you for looking, Bill Manns, Santa Fe, NM.
The item "Antique 1862 Civil War Officers Flask W. Fry & Co, NY, Capt Co B 15th M. M" is in sale since Thursday, June 18, 2020. This item is in the category "Collectibles\Militaria\Civil War (1861-65)\Original Period Items\Other Civil War Original Items".
The seller is "zon0ao7" and is located in Santa Fe, New Mexico. This item can be shipped to United States.