This build is mentioned in Microsoft Antitrust docs, namely document PX07614. It was originally believed to be a typo of build 34e. It's also mentioned in build 61d's README file.
Both, the antitrust docs and the README from build 61d indicate this build is Beta 2. It was compiled around 28th August 1991. There could be a Japanese version of this build as well, as PX01171 suggests.
