It  (The HA-11D) comes close but is not the Original 240z antenna..  Length differs and top...   sorry.

as far as I know and searched a bit too, this is the one all use to replace their own and supposed to be the original one... and the original antenna is Harada.

If it is a different Harada model and not this one, then this is my mistake and I am sorry if mislead previous buyers (if anyone needs a refund I can do it) but it still fits better than any other antenna.

I will edit my post just because I am not certain 100%

The mast tip is different from the earliest versions.  We discussed this years ago.  The very earliest versions had a pointed tip where as this version has a flat tip.  I don't know about the length.  It IS the original manufacturer and I believe will fit all S30 models.  Sorry for the rotated picture.

Finally home in front of my parts book and photo files.  Thought I would throw a little info out there.

Nissan lists this antenna as 27350-E4125 KIT-AERIAL AUTO TUNING (RADIO)  it would coincide with 27320-E4125  RECEIVER RADIO AM AUTO-TUNNING  The E8800, E8825, and N3600 are the AM/FM 5-button radios.  The antennas associated with them would be 27350-E4127 and N3600.  There are optional antennas that coincide with the optional AM 8-Track Stereo; 27350-E4126 and E4128.

Here's some antenna porn from my files.  I don't know anything about the black coil antenna.  It has a different tip as well.  The Harada antenna is the one shown in my parts book and the tip is the blunt topped version with the black ring.

If you're going for originality, it matters. Make sure it's a semi-automatic too. I bought a fully auto for mine that works fine with my Retro Sound system.

The one I sell is indeed semi-automatic ?