A vintage firearms maintenance accessory lot comprising an amber glass bottle of Hoppe's No. 9 Nitro Powder Solvent and its original cardboard retail box. The bottle features a wrap-around paper label with a prominent red graphic 9, identifying the contents as Nitro Powder Solvent No. 9. The label includes manufacturer information for Frank A. Hoppe, Inc., located on North Eighth Street in Philadelphia, Pennsylvania. The bottle is sealed with a knurled metal screw cap. The accompanying yellow cardboard box mirrors the bottle's labeling and includes a graphic illustration of the product along with instructional and advertising text. This item is a classic example of mid-20th-century American firearms cleaning equipment and ephemera.