Excelsior 120-Bass 41-Key 6-Treble Switches Black Piano Accordion w/Case #27012. Up for sale an Excelsior 120-Bass 41-Key 6-Treble Switches Black Piano Accordion w/Case – #27012! This beautiful instrument is a Used Model in Good Cosmetic Condition and in Perfect Playing Condition. On this one, the silver “Electronic” glued logo is unstuck and missing (see 7th and 16th pictures), there are empty screw holes on the upper back side (see 23rd and 24th pictures) and there are several scratches, marks, few dents, tiny notches, slight finish/plating deterioration and few other signs of wear here and there (see 15th to 25th pictures), but nothing major. Also, there are some scratches, notches and ...