I can't see the picture, but generally speaking, TT Tenors will have a spoon shaped alt. F# key between the right hand palm keys and the line of main tone holes. The TT C-Melodies will have the alt. F# key wrapped around the body with the tone hole lined up with the thumb rest/hook. Some late TT C-Melodies (after 200K, I believe) might have the spoon alt. F#, and in that case it's best to ask the length of the horn without the neck attached (around 29" for a tenor and around 25" for a C Melody).