The early and late caps are similar in appearance. Both are domed with mesh breather filters in the bottom. The
early cap has a flat top profile; the late cap profile has 3 thumb grips, and a round, domed, profile. Early caps are
black. Late caps are found painted black or hammer-tone (specific color unknown) gray.
Decal. A decal is fitted to the oil filler cap tops. Two basic styles of decals are used. The early decal is divided in
a pattern of concentric circles. Later a pie pattern decal was used. The following variations are known:
TR2/3 -- Large concentric circle decal, black with white markings.
TR3A -- Large pie-pattern decal, black with white markings.
TR3A -- Little concentric circle decal, black with white markings fits caps with thumb-holes.
TR3A/3B -- Little pie-pattern decal fits the caps with thumb-holes.
TR3B -- Little pie-pattern decal, Red with white markings (only observed on some TR3Bs with hammertone caps).