There are some images available showing Windows 1.0 DR1 from around December 1983 - January 1984.
Its not confirmed if this is DR1 or not, but is assumed DR1 due to the date shown on some images.
Known applications:
Text
Word
Calendar
Paint
Plan
Chart
Text, Calendar, Paint
Text
- WindowsDR1.3.gif
Word, Plan, Chart
Recreation
- DR1 HQ Recreate.png
Recreation of the Second image
