Conn 4C New Wonder Eb Upright Alto
Date: 1924. (Drawing)
The New Wonder altos with upright bell were the 2C/3C which were top action instruments, and the 4C/5C (pictured here) which were front action instruments. The 4C/5C had a #3 (0.500") bore and was produced from at least 1919 to 1930.
What Conn said in 1924:
The type of Alto illustrated on this page [is] most popular for marching and other outdoor engagements. Conn Altos are unequalled for brilliance of tone and ease of blowing because the taper branches are shaped to exact dimensions by the patented expansion process, and the valves are quick acting and smooth in operation because they have been designed and built after fifty years of experience in this work.