The Holley Manufacturing Co. was a Lakeville, CT based company that was founded way back in 1844 by Alexander Holley.  The company made very high quality knives before going out of business circa the late 1930s. 

Holley marked pocket knives are highly desirable collectibles.  AAPK members post them for sale on occasion, but they don't come around as often as many other great old American knife brands due to their scarcity.