Trade Card: Adolph Birgfeld, Piano Manufacturer, Philadelphia, PennsylvaniaTrade card advertising Adolph Birgfeld, successor to E. N. Scherr, manufacturer of grand, square, and upright pianos, located at 139 South Seventh Street, corner of Walnut Street, Philadelphia, Pennsylvania. The card is undated, but based on the style it is likely from the late 19th century.