Sheafers Imperial III conical nib Stainless, Black GT.    

Very smart looking Sheaffers Imperial III, with the Australian Stainless steel & Gold Conical Nib that is F fine.  The filling mechanism is a twist end cap and slide piston mechanism.  Insert into ink and depress piston, leave in ink a few seconds and the ink sac expands to draw ink in, screw the cap closed.  Condition is very good.  Be Lucky