This is a rare and luxury Russian button accordion (bayan) Yasnaya Polyana of a high class. Tula bayans are considered the best quality bayans ever made in Russia. This bayan has a converter bass system. It has a switch on the bass side that allows it to play as a free bass or as a Stradella! A free-bass system is a system of bass buttons on an accordion, arranged to give the performer greater access to playing melodies on the left-hand manual of the instrument and to forming one's own chords, by providing a button board of single-note buttons with a range of three octaves or more, in contrast to the standard Stradella bass system which only allows bass notes (range of a major seventh) and preset major, minor, dominant seventh, and diminished chords. This is a perfect professional bayan for any advanced, professional users for concerts and shows of any kind. This great Tula bayan has a very beautiful, rich treble sound and a deep and powerful bass sound! The uniqueness of this bayan is that treble reeds and bass reeds (voices) are made from all-in-one (solid) copper pieces. It gives this instrument a unique, charismatic sound! You have a great chance to buy original, authentic bayan for a really good price! Original Russian Tula bayans have a much more powerful bass sound than most German or Italian button accordions. It comes with brand-new leather straps and a brand-new soft case. This accordion was carefully checked, tuned and completely prepared for long-term playing.