Release Date: January 1983 (System V Release 1)
Released By: AT&T's Unix Support Group (USG)
Source Code: A portion of the PDP-11 code is browseable in the System V source tree
Documentation: included in the source code

From https://en.wikipedia.org/wiki/UNIX_System_V:Wikipedia

UNIX System V (pronounced: “System Five”) is one of the first commercial versions of the Unix operating system. It was originally developed by AT&T and first released in 1983. Four major versions of System V were released, numbered 1, 2, 3, and 4. System V Release 4 (SVR4) was commercially the most successful version, being the result of an effort, marketed as Unix System Unification, which solicited the collaboration of the major Unix vendors. It was the source of several common commercial Unix features. System V is sometimes abbreviated to SysV.