Question About ST Dupont BS 1959

[bringthenoise]

Hi all,

After extensive research into the model of my ST Dupont lighter, I've concluded that it's a 1959 BS model. My question is, so far as I'm aware this model was only originally available in silver plating whereas mine is gold plated. It is the large model, with geometric pattern, horizontal text on the underside (rather than the later vertical stamping) and the original screw on cap for the gas refill nozzle. It also has the notched wheel next to the gas outlet for turning it off when changing flints.

Thanks for the time!