Hi,
here´s a Link to
http://www.yydag.com/en/index.php, seemingly the original manufacturer of all these Amprobe, Eakins, Swift and all other expensive european microscopes.
Here the SZM7045N(T) and XT series are of interest. Somewhere on the website they simply state that the N stands for ´New´, but technically still the same.
The new ones have the focusing dial knobs to the left and right side to the front, while the earlier versions have them to the back.
The earler XT series features a conical flange for the LED ringlight, the N-types the cylindrical flange.
regards
Calvin