It should be iron gall, unless Turkey had some laws or similar which restricted import of ig inks, so Pelikan may have made one without ig for the Turkish market (like today in the US).
If there are particles on the bottom and they don't dissolve after shaking and are still there after shaking and settling, then it definitely is iron gall.
I would be careful with this ink and would be hesitant to put it in any pen, which is hard to replace.
Also if there are indeed particles (oxidized ig) and you still want to use the ink in a fp, then let the particles settle and fill only once they are firmly on the bottom. It is generally not adviseable to shake ig inks and then fill (due to exactly those ig particles, which inevitably form because of air exposure).
It is a nice find imo, though J Herbin still uses bottles like that, so it isn't quite as great a find as some vintage inks which are in bottles not made anymore. But if you like and enjoy your purchase, then it was a fantastic find, regardless of what anyone says!