August Wilhelmj, German violinist (1845-1908
CDV photo
reverse has a CDV photo of Edward O'Conner Terry
The photos are affixed to opposite sides of a sheet of stiff yellow paper with their names printed below their photos. 
Photos are 2.25 x 3.5 inches and in excellent condition. 
The backing paper is 2 7/8 x 4 3/8 inches and has some mild waviness.