The Castell 9000 is not my favorite pencil, but I find myself attracted to variations of it. The Castell 9007 is simply the eraser-topped version of the classic 9000; nowadays it is assigned the same number (as is the Jumbo), but in the past it seems to have existed as a separate model.
The specimens I have are old enough to sport the olive green (as opposed to the modern forest green) coat, but not old enough to incorporate the more attractive hexagonally fitted ferrule that adorns the Staedtler Mars Lumograph 2390.
And I find it hard to date A. W. Faber pencils! Here is a small sampling of Castell 9000s (with the 9007 thrown in) with different printings. Never a dull moment…
(Addendum 7/14: I found an authoritative collection of Castell 9000s at Fred’s Pencils. Seems like I got the order more or less right!)