I've finally found that magazine article with the Arado profiles Paul. It confirms the 72/73/65 colour scheme, in 1941, along with Prinz Eugen's aircraft the same, in spring '41. Both have a white spinner tip, and the unit badge on the nose, immediately behind the cowling. The codes for Bismark's aircraft are shown as T3 + LK (red L), the unit designation being I/Bordfliegerstaffel 196.