The J40M is the original name for the J40 and was produced from 1985 to 1989. This is a 1988 J40M. It has beautiful Indian rosewood back and sides. The top has had pick wear and a repaired crack. The top has been oversprayed. A new pick guard was installed. The bound fingerboard is a rich ebony. The frets are original and have been polished and crowned. Note the abalone inlays. Very nice. The action is low and smooth making it wasy to play. The sound is great with a rich Martin tone. It was played often by previous owner, thus the pick wear on the top. It ships in a newer hard shell case.