There seems to be a lot of variation among vintage blades. For example, the three-hole green wrapper Gillette blades from the 'teens seem a lot thicker than the later Blue Blades, which in turn seem thicker than the 1940's Gillette Thin Blades. Maybe the Blue Blades were more "typical" of most vintage blades?
This is the only 3 hole blade I have. I haven't seen any posts of any DE blades being thicker than .006".