Your bottom illustration is the proper BK56 cover.
BK56 is
not illustrated in the Unitrade catalogue. What you are referencing is a note regarding the 'counting tabs' found on BK56 through BK100.
Starting with the 2021 Unitrade, the note (and cover illustration) regarding the counting tab was modified to look like this:

The note appears
above BK56 but it still not an illustration of the cover of BK56. All cover illustrations have a respective caption centered under the illustration noting the correct catalogue number.
Robin Harris
Unitrade Editor