Prized possession

Never seen one of those!

Does it take a standard DE blade?

What purpose doe the 'roller' serve?

It takes a wedge blade or, happily, a GEM blade. The roller sits up front and ... well, rolls. Think of it as an open comb single edge where the comb rolls with your face.

As I got it, showing the blades:



... and with a GEM installed:



The design was licensed to Henckels for their Rapide ... sans the roller guard: