The picture shows Pickel's quartet in ca. 1861 with Pickel (1st violin), Albrecht (2nd violin), Weichmann (viola), and Seifert.
Student of Anton Traeg (1819–1860) of the Traeg publishing family, at the Prague Conservatory, as was Jan Oertel (1827–1889) who spent his career in Zagreb and was the teacher of Juro Tkalčić (1877–1957).
