If your label isn't present or readable, you can go to Menu > Diagnostics > Software Rev and see what's listed for "UOC" (universal outdoor controller)
It was added in Ver 2.010, per the Pentair firmware revision doc:
Version 2.010 5/5/08
New processor upgrade requires version 2.010 and higher. Cannot be applied to older EasyTouch systems.
Added IntelliBrite Pool/Spa light support
If your board was built before 5/5/08, you'll need a new board since the new 2.x firmware won't fit on the old 1.x boards