The 'E' Type Forum

Hi everyone, after the sanding process I found a sign on central bulbe of bonnet. This sign doesn't apper with painting but only after sanding.
It's seems the letters "MB" or "M3".
Maybe the initial of who assembled it?

Anyone know it?

Yes, many of the panels will have initials , often in crayon, indicating who did the assembly work ( sometimes particularly in the fascia area the body number will be written in crayon )