[nat]

I've been using a black light and naked-eye comparisons to authenticate pre-war cards, but decided that it's time to get some magnification. Cycleback suggests something with 100x. How much do you need to pick out the distinctive ridges around lots of early printing? How much magnification do you need to distinguish modern color half-tone lithography from the kind that you'd find on T206s?

And, more to the point, any recommendations on what model/brand loupe or microscope to get?