worksman_fork
Their Fork
This manufacturer's fork is specific to their brand.  The top is threaded, with a slot cut into the steerer tube so it can be squeezed onto the handlebar stem quill rather than using a standard handle bar stem with a wedge on the bottom.  This fork is manufactured in the most inexpensive way.  Note the ends of the fork are made by just smashing down the fork legs and cutting a slot for the axle.