The serial number (150048) is that of an ED 1200/11, around the mid point of the very short production run of < 100 units. However, the outward appearance is *not* of an ED lens head of that vintage, as already noted by Roland and me.
I find it highly unlikely that Nikon should use "scrap parts" from the earlier model to make a new unit in their new lens series. Most likely parts from the non-ED model won't fit the ED version at all.
Thus, per the principle of Occam's Razor, we end up with the plausible explanation of a non-ED lens with a misrepresented serial number. Perhaps the wrong serial number was taken down or their serial number records are confused.
