AndyA
Wore out three sets of tires already!
I believe that is a Komet single-speed hub. Are you sure that it has a hollow axle? The bike could have easily been switched from 3-speed to single speed. You can reverse the process, if you like, by throwing a 3-speed hub on there plus caliper brakes. The blue paint and decals look original. Could the different color under the pulley clamp be from fading? For insight into fading, compare the underside of the frame to the top.