1979 Martin EM-18, Near mint with original hard case .. This guitar is the 280th one made .   The first numbered was 1000, the first shipped was 1004. The difference between the E and the EM is that the EM had a 3 position coil selector switch. Some EMs may have also been equipped with Mighty Mite pickups instead of the DiMarzios. The  PAF was in rhythm position and super distortion in treble position. 

1979 Martin EM-18