Kalliwoda, J. - Duo No. 2 (all Mvts.) Op. 70 (Viola Duo)
Johann Kalliwoda (1801-1866) was a Czech violinist and composer.
He worked as a conductor in various royal courts, where his duties also included composing for and managing of the the instrumental and choral groups. This images and video offer a preview of the first movement. Movements 2 and 3 are also available for preview elsewhere on this site.