For Sale: 1930s Gibson-made Kalamazoo Senior Tenor Guitar w/ Case Beautiful example of a Gibson-made Kalamazoo Senior tenor guitar from the 1930s. The Senior models were a step above the standard Kalamazoos, and this one shows why. Serial number 724 Condition: Very good for its age. Frets have been leveled and polished. A top crack was professionally repaired years ago and remains solid. Everything appears original. Tone: Clear, punchy, and thick—classic vintage Gibson sound with great projection. Case: Includes what appears to be the original case, a rare find. This is a lovely player’s instrument with real vintage character and a strong, resonant voice.