Easily the nicest Mannheim rule in the collection. If I say some other Mannheim rule is better, ignore me. I'm either lying or stupid. This rule is really nice. The construction's similar to the small no-name german rule i've got, but this one's got a cursor, is in perfect shape, and it's got some nifty additional features. In particular, there's a cm scale printed in the well of the body, which allows you to extend the slide out to make a longer ruler. Like most German rules, it has those inexplicable multiple hairlines on the cursor. It's also really heavy for a wooden rule.
The box and rule are labelled "Höltgebaum & Heinicke A.G., Berlin, N.W. 7", but the Faber-Castell name and logos are engraved inside the well, so it was most likely manufactured by Faber.