Help with identification of ST Dupont Lighter

Thanks, everyone for your interest. The lighter is gold in color with black inlay but It isn't marked with any metal content such as K (karat). I'm assuming it is plated if any real gold at all. You think the gold parts could be solid even though it isn't marked? I've seen some that were real gold but they were marked at the bottom of one of the narrow sides.

I don't know if it works or not as I dont have fuel. I does also need a flint. I figured out how to open the flint chamber but I don't have a flint either. Any way to test it without fuel? Just curious what you mean $-wise by "low" resale? It feels pretty hefty weight-wise. It certainly is a well made piece. I have an acid gold testing kit but I'm afraid to put any directly on the surface and risk any damage.

This forum has been very responsive and helpful. Thanks to all very much. R