As title, this is a very early Boss NF1 pedal. The serial number dates it to November 1979. It has the long dash between the NF and 1 on the front, silver screw and the momentary LED that just flashes as a battery check when you turn the gate on or off - it does not stay on and was designed this way. The serial number is ink stamped in the battery compartment and is 8800.
Great condition for a 45 year old pedal with very few marks.