One thing on Priller's '190. The marking immediately aft of the '13' is always shown as a black'spot' in a white circle in profiles/drawings etc. However, I may be wrong, but I suspect this should be the red cross, in a white circle, signifying the First Aid Kit stowage on the hatch cover.
As I say, I could be wrong in this instance, and maybe Wojtek, Eric or Wayne can clarify this.
Terry.