A new Windows 1.0 pre-release build was found
Sunday, March 3 2019, 10:31 Windows 1.0 Permalink
And it's also an OEM release. Imagine that.
Tulip Computers (previously known as CompuData) shipped a pre-release version of Windows 1.0 from September 1985 with some of their machines, which is designated as 1.xx and/or 1.xy. You can read more about it in the BetaArchive topic.