The scanner did really funky things to all of my Acu-Maths, so they look a lot more stretched out than they should. Sorry.
This is a surprisingly nice, albeit weird, Mannheim rule. Like the 1211 and 511, it's made of some kind of weird material with a white laminate. It's fairly heavy and seems pretty well put-together, with the exception of the cheesy plastic cursor. You can see the base material in the circles on the ends of the slide; those are a pretty nice design feature, apparently intended to make it easier to grip and move the slide.