Hi Victa.ducky, I am assuming that you are going to restore this fantastic looking rare machine, I would take the mower into a Dulux Autocolour paint supplier or similiar auto paint shop, and they may be able to match perfectly the colour for you.....the original colour name; it may not help you as all as the original formulas have changed with the advent of technology...By the way.....from my computer screen, it looks like a GMH colour called "oyster metallic"
Best wishes for your project,.