Abel Hofkapelle 1770 - A painting of a large group of people

THE MUSICIANS AT THE DUCAL CHAPEL OF MECKLENBURG-SCHWERIN IN 1770, BY LEOPOLD AUGUST ABEL, a gouache finely painted on vellum, with white highlighting, with a contemporary inscription on verso ("Peint. par L:A[:] Abel.1770.") written in brown ink
19.5 x 24cms, probably painted at Ludwigslust, 1770,