Theodor Wachtel ( 1823 -1893 ) was a famous, legendary German tenor Though he mostly sang at the Hamburg Opera House he became famous in New York, Paris and London too.
A book about Wachtel and the singing techniques for tenors is a standard work.
2,5 x 4 inches, minor wear, scarce.
Opera Tenor Theodor Wachtel CdV. Ca. 1868