Windows NT 3.5 build 683

Windows NT 3.50.683.1 is mentioned in file  from Windows NT 3.50.854.1. It is the official Beta 2 build. Workstation edition of this build was leaked by a warez group in 1994, but the floppy disks were mistakenly dumped in 1.44MB format instead of DMF, resulting in major data loss. This means most of the disk images are broken and the build is unusable. Advanced Server edition was also leaked apparently, as it's mentioned in a warez CD list, but remains to be found.

Bootdisks for this build are available on BetaArchive FTP.