The large chrome knob is the advance. The smaller chrome catch nearby opens the back. The chrome catch in the center side opens the camera up. The chrome catch on the bottom is just a table rest point.
It's 45/2 Ektar lens enabled the Special to take pictures in almost any light. Pre-war models generally use the German made Compur shutter and an uncoated 45/2 Ektar lens with speeds of 1 to 1/500 plus T & B. Starting around 1941, wartime demands switched the shutter to the American Supermatic shutter with a coated lens. The Supermatic's shutter ran 1/400th to 1 second, plus T&B. The Compur allowed for in-between speed settings while the Supermatic did not. The Compur also proved to be more reliable in service, while the Supermatic commands higher collector prices due to rarity. Few Supermatic Bantams were produced during and after the war, before the Special was discontinued.
The Special has separate viewfinder and rangefinder windows, very nicely done and usable. A good thing too, since the rangefinder window is a very high 8x magnification rangefinder.