I picked this little thing up on eBay, and the only markings on it are "900" on the clip (presumably the silver content), and "PATENT-G.F." ("Gebrüder Fend?") on the inner barrel and on the paddle of the pusher. I would swear I've seen an article about this design, or one very similar, just recently, but I'm drawing a blank.
Note that the pusher comes completely out the back and the lead can be loaded from there, similar to Autopoint, DurOLite, et al.
Anyone?
-- Edited by Chthulhu on Saturday 29th of September 2012 07:39:28 PM
Definitely not American, which pulls it a bit outside of my area of expertise. However, I have seen that mechanism on British pencils marked "Lifelong."