One of the earliest Picketts made. Like most of their early models, this one is made of magnesium, and demonstrates pretty well why they abandoned it for aluminum. The magnesium oxidises pretty badly, causing the paint (pickett rules are not known for the high quality of their manufacture; unlike even the Acu-Math magnesium rules, which had a plastic laminate, Pickett's scales were painted directly on the metal) to bubble and discolor. This is one heck of a big, heavy rule, and it comes in this weird rubberized case. The printing on the back of the slide is a quick lesson in keeping track of the decimal point.