This is a Pickett N600-ES log log speed rule (slide rule). This is the same model slide rule that the astronauts took to the moon! The slide rule is all metal and comes with a leather carrying case. The case is in excellent working condition (the pull tab slips the slide rule out easily). It is showing light signs of wear (especially on the back of the clip), although it really just needs a good wipe down. The slide rule appears to be in near perfect condition. The numbers and markings... are in perfect shape (no sign of rubbing off). The slide is still tight, so the slide rule doesn't slip back and forth. There appears to be a little dirt around the edges of the sliding view finder, but otherwise the slide rule seems to be in perfect shape. If you have any questions or need any additional photos, please do not hesitate to contact us. Thanks for looking! Homeward Bound Pets Thrift Shop100% of the proceeds from our sales go to help homeless pets!www.hbpets.org