Cannot really judge by the photo, so to speak, but it look decent enough. One thing you might want to check is the inner screw thread on the barrel end. Fakes are known to have less well tuned thread where genuine Hero had very clean cut thread that usually with 3 to 4 thread in where fakes are known to have less. As a side note, the 616 been with us for decades literally and Hero had made many cosmetic alteration during the time so just by judging a certain element would not be sufficient to tell. Say the Jewel, I known of at least half a dozen variant myself. One certain way to judge the authenticity is to check the nib. The nib should be 19.5mm X 3mm which is unique to 616 and Hero's legend is stamped on the nib ( but you cannot see it unless you pull the nib off the pen ).
These days fake 616 are getting less exposure as quite obvious its far more profitable for those in that business to fake something even more expensive and thus get them even more profit.