I have a '70 mach 1 the marti report says. Option: argent styled steel wheels with white wall tyres. I have no Idea what they are. Could you please help?  

Argent is a silver paint color used. (see the on-line parts catalogs for photos of a styled wheel)  

Yeah, Argent is a dull gray color.  As far as the white wall tires (tyres); those were popular back in the 50's and 60's on American cars.  During the 50's the white walls were wider than during the 60's.  The steel belted  radial tire had not been invented yet back then, so the tires were nylon belted instead of steel belted.