I think you are referring to Thompson's version?[1] I am referring to Bourne's.[2] Even Joy's shell is older than that one.[3]

[1] 1971 (https://en.wikipedia.org/wiki/Thompson_shell)

[2] 1979 (https://en.wikipedia.org/wiki/Bourne_shell)

[3] 1978 (https://en.wikipedia.org/wiki/C_shell)