28/29 gas cap marking question (ID help)
 

Two caps with consistent vertical markings all the way around. A telltale sign of a reproduction?

Re: 28/29 gas cap marking question (ID help)
 

they are both old cheap reproductions with a vent hole in the top.

Re: 28/29 gas cap marking question (ID help)
 

...Thanks for the reply John.

Re: 28/29 gas cap marking question (ID help)
 

So....Is the vent hole in the top the give away sign of a reproduction?

Re: 28/29 gas cap marking question (ID help)
 

Are they brass or steel?

Re: 28/29 gas cap marking question (ID help)
 

steel (unfortunately)

Re: 28/29 gas cap marking question (ID help)
 

Original gas caps were vented but not with a hole in the top...picture is of a 28-29 cap.

Original radiator caps were not vented. The radiator vents through the overflow tube.

Both would have been plated brass.

The Judging Standards have a whole page (15-8) of line drawings of the different styles and years.

Re: 28/29 gas cap marking question (ID help)
 

I wondered whether the originals were brass or steel, I suspected brass, now I know, tnx.

Re: 28/29 gas cap marking question (ID help)
 

all of the originals that i have seen were brass. and did not have a vent hole on top