Marking: 1) (on barrel, both body sections, and kasten)
[eagle] / I. G. FREYER / [8-pointed star]
2) (on bell, near top) [8-pointed star]
University of Pennsylvania Museum of Archaeology and Anthropology
4900 Historical Woodwind Instruments: An Inventory of 200 Makers in International Collections. Phillip T. Young. London, 1993, pg. 81.
Musical Instruments of the Western World. McGraw Hill Book Company. New York, Toronto, 1967, pg. 236-237, fig. 93, ill.