The latest limited edition pen from Conway Stewart celebrates Sir Isaac Newton. The pen features hand painting on the cap and barrel of Newton and one of his most famous mathematical theories. The barrel shows the laws of motion and universal gravitation on the barrel and the cap has a likeness of Newton himself, taken from a portrait by Godfrey Kneller in 1689. The pen has an 18-carat gold nib which is available in a choice of eight grades. The pen is 25 numbered pieces available in fountain pen or roller ball and sells $2,450.