You're right! They were run-of-the-mill models... My tutor once told me that maybe 500 of those Sabre models like his were made. For some reason it says custom made on the 20th or 21st fret inlayed, though. But like you say, great guitars. His is in a very dark purple color. I'll try to get a pic of it for you guys, because the thing looks great!
It's no EX but it's an X, it has the piezos - as you can also see by the two output plugs, a little switch, a button and three knobs instead of two. It's a 520X to be precise (once again)... There's no mislabeling on that axe! I'm sure of it! The 620X doesn't even come in Jet Blue or Candy Apple. Do a websearch on Ibanez S620X
CA or
JB and you'll find nothing! The 620X comes in Wallnut Flat and Galaxy Black. The shop had the axe only in Candy Apple and Jet Blue colors... When I searched, I only found the
520XCA and JB on that Italian site.
IT IS NO 620X!!!! 
This makes me think.. Maybe I can get more data via that Italian site!? It says the model is new, in Italian of course (
nuovi means new)... But who knows how old that site might be!?
By the way, the country versions of Ibanez.com differ. According to the Dutch Ibanez.com, they 620X doesn't excist! :P Yet still, they have it in the shops!
And about that neck, if you say so, it's a Super Wizard then... Differs only two milimeters I just checked that on the site. So it's well possible I couldn't have felt or seen that, still weird that the Ultra Wizard on the S2120X is so fat... Still plays 'okay' though.
Anywayz, here's the serialnumber:
F0136579 Anyone of you guys know how to check it for date?
Wait a minute... I think I just found out... Take a look at the URL from that Italian site: "...Prodotti/Ibanez/2001..." It says
2001 in the middle! Whoops! Well, now I know for sure I guess...