S1 fuel cap.....original?

Is the fuel cap on my 1966 S1 original equipment?
If so…any ideas where to get a new seal in UK?

It doesn’t look like any original I’ve seen. What is stamped in the center of the cap? Looks like lettering.

You might take the cap by a spares shop and see if they have a cap with a gasket you can swap out.

The original fuel cap looked like this:

https://www.sngbarratt.com/uk/#!/English/parts/f4a886fe-0887-4166-9bfc-dc6b9bd3fc6c

Farther down that same SNG page I see this:

https://www.sngbarratt.com/uk/#!/English/parts/eb67f930-30ea-40cd-af0c-be84a0fc5da5

Though I have made one from sheet rubber that seems to be holding up okay.

that’s what mine looks like. I know it’s been on the car for at least 20 yrs

Oh jeez: that picture made me remember where Tweety’s original went.

It’s on an Auburn Speedster, somewhere!