On the site of classicshaving.com I was looking at the wonderfull Thiers Issard razors (art deco handles aso). But then my eye got by the listings of: "flat back" and 'frameback". Now I think I know what a frameback is... but what is a flat back? The same?
Furthermore, do you think a frameback is a better shaver of a heavier beard?

thanks, michel