Very interesting. The gun button is early spitfire. The grip and brake lever is not. It is an original spade grip, only not from a Spitfire. I think the grip is early firefly.
Incidentally, I have the complete column from K9844 in my Mk1cockpit. As diggers will know, spit spade grips don’t survive crashes. I had all the column and the gun button and brake lever. The rest had long since corroded away. I found an early meteor grip and used that.
Your grip is still very nice.