The unix-jun72 project has scanned in a printout of 1st Edition UNIX from June 1972, and restored it to an incomplete but running system. Userland binaries and a C compiler have been recovered from other surviving DEC tapes.
https://code.google.com/archive/p/unix-jun72/
via @akkartik
@neauoire I wonder if that version is captured here:
https://github.com/dspinellis/unix-history-repo