Actually that darker colour up top looks like the gunmetal colour used on some of the props:
GM(Fisher code) : WA7782
Make/Year Code : 84, L12
PPG/Ditzler : 3667
Dupont : B8403, G8634
Sherwin Williams : 33936
RM/BASF : 15381, 14066
Glasurit : GM-7782
Duplicolor DSGM344