It was written in 1764, or when Mozart was 8 years old. My personal impression is that Mozart experimented with various harmonic progressions.
The autograph score for this piece is available on IMSLP.
1st movement Molto Allegro --- Sonata Form?
bar1-30 : Exposition 1
bar31-58 : Exposition 2
bar59-92 : Development + Recapitulation 1
bar93-120 : Recapitulation 2
http://aeolianconsort.chakin.com/Mozart.htm
