Colour of WW2 Italian M33/RSI M33 Colour

[Vincenzo]

Hello,

I am refurbishing some M33 post war helmet shells to the WW2 colour, but not sure what is the best/historical colour to use.
What colour in the pictures would you say is best for WW2 Pre RSI and RSI.

Any help would be much appreciated.

Thanks
Vincenzo