The bottom lettering is may be the planes initial markings after the factory, once a pilot and number and group is established, they painted over it, the white squiggle means 4th group. My problem with it is the white 2 and the squiggle are to high, they should be more centered on the cross. Also this is where a good modeler could make the plane look 1000% better, the bottom letters/numbers should be faded and weathered, they were painted on long before the white ones were painted over and yet they appear to have been painted on 10 minutes latter. Yes Snake man is right, there is no reason for the black spot on the bottom of the cowling, that is an air intake, no exhaust comes out the back either, that is unless the engine is on fire
![Laughing :lol:](./images/smilies/icon_lol.gif)
Exit areas on aircraft with a lot of service time on them tend to get staining and streaks from minor leaks of oil or glycol, but intake areas never get that problem. Liquids tend to make streaks, rather than the type of stains that the model has. (Been around aircraft over 40 years !!) I still think it looks great, though !!