Windows 3.0 undated 1989 build

An undated screenshot of what is presumed to be a pre-release build of Windows 3.0 was shown by Craig Brockschmidt, the developer of the Windows 3.0 Calculator application, running Calculator version 3.00.13 on his website.

Given that the calculator in Windows 3.0 build 55 has the version number 3.00.13, this particular build could be earlier than 3.00.55.