Bf109E propeller markings and spinner dataplates
 

I would like to know if any of you can help me with some questions:

Many Bf109E propeller blades painted in dark color also had applied a small rectangle, (white or yellow?), placed about one fourth of the length, and measuring about one third of the width of the propeller. What was the purpose of this marking? Was there anything wrote on it?

On some propellers marked with the VDM logo, there is also a small rectangle on the base of the triangle. Is it possible to figure out what is written on the triangle basis and in the rectangle below it?

The third and last question is that on spinner and its backplate there were two dataplates riveted near the spinner’s catch. How they look like and what is written on them? (they look different to the ones on F/G series spinner)

I would really appreciate any help.

Best regards,

Fernando Estanislau