Amber glass round bottle that is about 4.5 ounces fluid capacity. FF marked pushed up blown molded antique cork bottle. Fairmount glass mark most likely Foster Forbes timeline, it is visible mark but obscured by the swirling. No chips or cracks with some natural aging/use signs. 4 7/8" tall, 2" across the shoulder, tappers to 1 7/8" at the bottom, 15/16" across the rim, 1/2" opening. Applied top, high up on the sides applied bottom.  Antique turn of the century bottle. Chemical, cleaner, likely could be a medicine.