Series 1 gear knob

[Lotus14S2]

I don?t have a photo, but my S1 Bourne bodied car?s shift knob, but it has a depressed center, brass threaded insert, and a cloisonn? medallion. Looking at the photo of the brass medallion; it might be that it was painted or cloisonn? , at one time, and the finish was removed or chipped off.
Also my knob was oiled and has no varnish or lacquer finish; difficult to keep clean.